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x in (-oo:+oo)
7/10 = x/15 // - x/15
7/10-(x/15) = 0
7/10-1/15*x = 0 // - 7/10
-1/15*x = -7/10 // : -1/15
x = -7/10/(-1/15)
x = 21/2
x = 21/2
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