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x in (-oo:+oo)
-25 = (5/7)*x // - (5/7)*x
-((5/7)*x)-25 = 0
(-5/7)*x-25 = 0
-5/7*x-25 = 0 // + 25
-5/7*x = 25 // : -5/7
x = 25/(-5/7)
x = -35
x = -35
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