a. -1-(5-x)=-3
5-x=(-1)-(-3)
5-x=2
x=5-2
x=3
b. 132-(x+5)=-24
x+5=132-(-24)
x+5=156
x=156-5
x=151
c. 3.(x-2)+2x-15=-1
3x-6+2x-15=-1
3x+(-6)+2x+(-15)=-1
5x+(-21)=-1
5x=(-1)-(-21)
5x=20
x=20:5
x=4
a)x=3
b)x=151
c)x=4
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