`1/5 + x =2/3`
`x=2/3-1/5`
`x=10/15-3/15`
`x=7/15`
____________________________
`-5/8 + x = 4/9`
`x=4/9 - (-5/8)`
`x=4/9 + 5/8`
`x=32/72 + 45/72`
`x=77/72`
__________________________________
`1 3/4 x + 1 1/2 = (-4/5)`
`7/4 x + 3/2 = (-4/5)`
`7/4 x = (-4/5) - 3/2`
`7/4 x = (-8/10) - 15/10`
`7/4 x = (-23)/10`
`x = (-23)/10 : 7/4`
`x= (-23)/10 xx 4/7`
`x=(-46)/35`
_____________________________________
`1/4 + 3/4 x = 3/4`
`3/4 x = 3/4 - 1/4`
`3/4 x = 2/4`
`3/4 x = 1/2`
`x=1/2:3/4`
`x=1/2xx4/3`
`x=2/3`
________________________________
x.(1/4+1/5)-(1/7+1/8)=0`
`x.(5/20+4/20)-(8/56 + 7/56)=0`
`x. ((5+4)/20) - ((8+7)/56) = 0`
`x. 9/20 - 15/56 = 0`
`x . 9/20 = 0 + 15/56`
`x . 9/20 = 15/56`
`x=15/56 : 9/20`
`x=15/56 xx 20/9`
`x=25/42`
___________________________________
`3/35 - ( 3/5 + x) = 2/7`
`3/5+x=3/35-2/7`
`3/5+x=3/35-10/35`
`3/5+x=(-7)/35`
`3/5 +x = (-1)/5`
`x=(-1)/5-3/5`
`x=(-4)/5`
____________________________________
`3/7 + 1/7 : x = 3/14`
`1/7 : x = 3/14 - 3/7`
`1/7: x = 3/14-6/14`
`1/7:x=(-3)/14`
`x=1/7: (-3)/14`
`x=1/7 xx (-14)/3`
`x=(-2/3)`
_____________________________________
`(5x-1)(2x -1/3)=0`
`=>` \(\left[{}\begin{matrix}5x-1=0\\2x-\dfrac{1}{3}=0\end{matrix}\right.\)
`=>` \(\left[{}\begin{matrix}5x=1\\2x=\dfrac{1}{3}\end{matrix}\right.\)
`=>` \(\left[{}\begin{matrix}x=1:5\\x=\dfrac{1}{3}:2\end{matrix}\right.\)
`=>` \(\left[{}\begin{matrix}x=\dfrac{1}{5}\\x=\dfrac{1}{6}\end{matrix}\right.\)
Vậy....
`#LeMichael`
`( 3 1/4 :x). (-1 1/4) = -5/3 - 5/6`
`( 3 1/4 :x). (-1 1/4) = -10/6 - 5/6`
`( 3 1/4 :x). (-1 1/4) = -15/6`
`( 3 1/4 :x). (-1 1/4) = -5/2`
`(13/4 : x) . (-5)/4 = (-5)/2`
`13/4 : x = (-5)/2 : (-5)/4`
`13/4 : x = (-5)/2 xx (-4)/5`
`13/4:x = 2`
`x=13/4:2`
`x=13/4xx1/2`
`x=13/8`
____________________________________________
`(-1)/4 - 3/4 : x = (-11)/36`
`3/4:x = (-1)/4 - (-11)/36`
`3/4:x= (-1)/4+11/36`
`3/4:x=1/18`
`x=3/4:1/18`
`x=3/4xx18`
`x=27/2`
______________________________________
`(-1 1/5 + x) : (-3 3/5) = (-7)/4 + 1/4 : 1/8`
`(-1 1/5 + x) : (-3 3/5) = (-7)/4 + 1/4 xx 8`
`(-1 1/5 + x) : (-3 3/5) = (-7)/4 + 2`
`(-1 1/5 + x) : (-3 3/5) = (-7)/4 + 8/4`
`(-1 1/5 + x) : (-3 3/5) = 1/4`
`(-6/5 + x) : (-18/5) = 1/4`
`-6/5 + x = 1/4 xx (-18)/5`
`-6/5+x=(-9)/10`
`x=(-9)/10-(-6/5)`
`x=(-9)/10+6/5`
`x=(-9)/10+12/10`
`x=3/10`
__________________________________________
`(-22)/15 x + 1/3 = | -2/3 + 1/5|`
`(-22)/15 x + 1/3 = | -10/15 + 3/15|`
`(-22)/15 x + 1/3 = 7/15`
`(-22)/15 x = 7/15 - 1/3`
`(-22)/15 x = 2/15`
`x=2/15 : (-22)/15`
`x=2/15xx(-15)/22`
`x=(-1)/11`
____________________________________________
`#LeMichael`
