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x in (-oo:+oo)
(1/5)*x-1 = (-4/5)*x-13 // - (-4/5)*x-13
(1/5)*x-((-4/5)*x)-1+13 = 0
(1/5)*x+(4/5)*x-1+13 = 0
x+12 = 0 // - 12
x = -12
x = -12
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