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-7 = (-4/5)*(5-x) // - (-4/5)*(5-x)
-((-4/5)*(5-x))-7 = 0
(4/5)*(5-x)-7 = 0
4/5*(5-x)-7 = 0
4/5*(5-x)-7 = 0
-4/5*x-3 = 0
-4/5*x-3 = 0
-4/5*x-3 = 0 // + 3
-4/5*x = 3 // : -4/5
x = 3/(-4/5)
x = -15/4
x = -15/4
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