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