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x in (-oo:+oo)
(4/5)*(x-1) = -4 // + 4
(4/5)*(x-1)+4 = 0
4/5*(x-1)+4 = 0
4/5*(x-1)+4 = 0
4/5*x+16/5 = 0
4/5*x+16/5 = 0
4/5*x+16/5 = 0 // - 16/5
4/5*x = -16/5 // : 4/5
x = -16/5/4/5
x = -4
x = -4
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