a: =>x-2=18
hay x=20
b: =>2x=-38
hay x=-19
c: \(x=\dfrac{-10}{21}\cdot\dfrac{-3}{5}=\dfrac{30}{105}=\dfrac{2}{7}\)
d: =>x/3=-5/6+1/4=-10/12+3/12=-7/12
=>x=-7/4
e: =>x=2/3-4/5=10/15-12/15=-2/15
`x - 72 : 36 = 18`
`x- 2 = 18`
`x=18+2`
`x=20`
_________________
`2x + 27 = -11`
`2x = -11 - 27`
`2x= -38`
`x=-38:2`
`x=-19`
________________________
`x : (-3)/5 = (-10)/21`
`x=(-10)/21 xx (-3)/5`
`x=2/7`
________________________
`x/3 - 1/4 = (-5)/6`
`x/3 = (-5)/6 + 1/4`
`x/3 = (-7)/12`
`x = (-7)/12 xx 3`
`x= -1,75`
___________________________
`4/5 + x = 2/3`
`x=2/3-4/5`
`x=10/15 - 12/15`
`x=(-2)/15`
