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x in (-oo:+oo)
(-4/5)*(x+15) = 4 // - 4
(-4/5)*(x+15)-4 = 0
-4/5*(x+15)-4 = 0
-4/5*(x+15)-4 = 0
-4/5*x-16 = 0
-4/5*x-16 = 0
-4/5*x-16 = 0 // + 16
-4/5*x = 16 // : -4/5
x = 16/(-4/5)
x = -20
x = -20
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