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x in (-oo:+oo)
10 = (5/7)*x // - (5/7)*x
10-((5/7)*x) = 0
(-5/7)*x+10 = 0
10-5/7*x = 0 // - 10
-5/7*x = -10 // : -5/7
x = -10/(-5/7)
x = 14
x = 14
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