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x in (-oo:+oo)
5/7 = 10*x // - 10*x
5/7-(10*x) = 0
5/7-10*x = 0
5/7-10*x = 0 // - 5/7
-10*x = -5/7 // : -10
x = -5/7/(-10)
x = 1/14
x = 1/14
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