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x in (-oo:+oo)
x/12-(x/8) = 15 // - 15
x/12-(x/8)-15 = 0
-1/24*x-15 = 0 // + 15
-1/24*x = 15 // : -1/24
x = 15/(-1/24)
x = -360
x = -360
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