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x in (-oo:+oo)
(1/5)*x+13 = (4/5)*x-17 // - (4/5)*x-17
(1/5)*x-((4/5)*x)+13+17 = 0
(1/5)*x+(-4/5)*x+13+17 = 0
30-3/5*x = 0 // - 30
-3/5*x = -30 // : -3/5
x = -30/(-3/5)
x = 50
x = 50
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