7) \(x-5=\dfrac{2}{5}+\dfrac{1}{3}\)
x-5 = \(\dfrac{11}{15}\)
x = \(\dfrac{11}{15}+5\)
x = \(\dfrac{86}{15}\)
7: =>x-5=2/5+1/3=11/15
=>x=11/15+75/15=86/15
8: =>4,5-2x=1
=>2x=3,5
=>x=1,75
9: =>x-7/18=-12/29:18/29=-3/2
=>x=-3/2+7/18=-27/18+7/18=-20/18=-10/9
13: =>x/3=-1/7+10/21=-3/21+10/21=7/21=1/3
=>x=1
14: =>2,8x-32=-60
=>2,8x=-28
=>x=-10
15: =>5/7:x=1/6-4/5=5/30-24/30=-19/30
=>x=-5/7:19/30=-150/133
8 ) \(\left(4,5-2x\right):\dfrac{3}{4}=\dfrac{4}{3}\)
\(4,5-2x=\dfrac{4}{3}\times\dfrac{3}{4}\)
4,5 - 2x = 1
2x = 4,5 -1
2x = 3,5
x = 3,5 : 2
x = 1,75
`\color {blue} \text {_Namm_}`
`7, (x-5)-1/3=2/5`
`x-5=2/5+1/3`
`x-5=11/15`
`x=11/15+5`
`x=86/15`
`8, (4*5-2x) \div 3/4=1 1/3`
`4,5-2x=1 1/3*3/4`
`4,5-2x=1`
`2x=4,5-1`
`2x=3,5`
`x=3,5 \div 2`
`x=1,75`
`9, (x-7/18)*18/29=-12/29`
`x-7/18=(-12/29) \div 18/29`
`x-7/18=-2/3`
`x=(-2/3)+7/18`
`x=-5/18`
`10, 1.5+1 1/4*x=2/3`
`1 1/4*x=2/3-1,5`
`1 1/4*x=0,8`
`x=0,8 \div 1 1/4`
`x=0,64`
`11,(2,7*x-1 1/2*x) \div 2/7=-21/4`
`2,7x-1 1/2x=-21/4*2/7`
`x*(2/7-1 1/2)=-3/2`
`x*-17/14=-3/2`
`x=(-3/2) \div (-17/14)`
`x=21/17`
`12, 3 1/3x+16 3/4=-13,25`
`3 1/3x=(-13,25)-16 3/4`
`3 1/3x=-30`
`x= (-30) \div 3 1/3`
`x=-9`
`13, x/3-10/21=-1/7`
`x/3=(-1/7)+10/21`
`x/3=1/3`
`-> x=1`
`14, (2,8x-32) \div 2/3=-90`
`2,8x-32=-90*2/3`
`2,8x-32=-60`
`2,8x=(-60)+32`
`2,8x=-28`
`x=-28 \div 2,8`
`x=-10`
`15, 4/5+5/7 \div x=1/6`
`5/7 \div x=1/6-4/5`
`5/7 \div x=-19/30`
`x=5/7 \div (-19/30)`
`x=-150/133`
