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x in (-oo:+oo)
(-4/5)*(x+7) = 4 // - 4
(-4/5)*(x+7)-4 = 0
-4/5*(x+7)-4 = 0
-4/5*(x+7)-4 = 0
-4/5*x-48/5 = 0
-4/5*x-48/5 = 0
-4/5*x-48/5 = 0 // + 48/5
-4/5*x = 48/5 // : -4/5
x = 48/5/(-4/5)
x = -12
x = -12
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