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x in (-oo:+oo)
35 = (5/7)*x // - (5/7)*x
35-((5/7)*x) = 0
(-5/7)*x+35 = 0
35-5/7*x = 0 // - 35
-5/7*x = -35 // : -5/7
x = -35/(-5/7)
x = 49
x = 49
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