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x in (-oo:+oo)
x/12-7 = x/4 // - x/4
x/12-(x/4)-7 = 0
-1/6*x-7 = 0 // + 7
-1/6*x = 7 // : -1/6
x = 7/(-1/6)
x = -42
x = -42
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