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x in (-oo:+oo)
(1/5)*x-2 = (-4/5)*x+1 // - (-4/5)*x+1
(1/5)*x-((-4/5)*x)-2-1 = 0
(1/5)*x+(4/5)*x-2-1 = 0
x-3 = 0 // + 3
x = 3
x = 3
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