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x in (-oo:+oo)
x/(-7) = 12-4 // - 12-4
x/(-7)-12+4 = 0
-1/7*x-8 = 0 // + 8
-1/7*x = 8 // : -1/7
x = 8/(-1/7)
x = -56
x = -56
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