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3x+8=4x-5
3x -4x=-5-8
-1x=-13
x=-13/-1=13
b.
18x-15=19x+7
18x-19x=7+15
-1x=22
x=22/-1=-22
c.
14x-10=15x+7
14x-15x=7+10
-1x=17
x=17/-1=-17