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x in (-oo:+oo)
15/35 = 3*x // - 3*x
15/35-(3*x) = 0
15/35-3*x = 0
3/7-3*x = 0 // - 3/7
-3*x = -3/7 // : -3
x = -3/7/(-3)
x = 1/7
x = 1/7
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