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x in (-oo:+oo)
(1/5)*x+2 = (4/5)*x-7 // - (4/5)*x-7
(1/5)*x-((4/5)*x)+2+7 = 0
(1/5)*x+(-4/5)*x+2+7 = 0
9-3/5*x = 0 // - 9
-3/5*x = -9 // : -3/5
x = -9/(-3/5)
x = 15
x = 15
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