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x in (-oo:+oo)
13/17 = x/12 // - x/12
13/17-(x/12) = 0
13/17-1/12*x = 0 // - 13/17
-1/12*x = -13/17 // : -1/12
x = -13/17/(-1/12)
x = 156/17
x = 156/17
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