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x in (-oo:+oo)
7/12 = x/15 // - x/15
7/12-(x/15) = 0
7/12-1/15*x = 0 // - 7/12
-1/15*x = -7/12 // : -1/15
x = -7/12/(-1/15)
x = 35/4
x = 35/4
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