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