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x in (-oo:+oo)
7/10 = x/12 // - x/12
7/10-(x/12) = 0
7/10-1/12*x = 0 // - 7/10
-1/12*x = -7/10 // : -1/12
x = -7/10/(-1/12)
x = 42/5
x = 42/5
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