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x in (-oo:+oo)
125 = (5/7)*x // - (5/7)*x
125-((5/7)*x) = 0
(-5/7)*x+125 = 0
125-5/7*x = 0 // - 125
-5/7*x = -125 // : -5/7
x = -125/(-5/7)
x = 175
x = 175
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