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x in (-oo:+oo)
x/(-3) = 8-7 // - 8-7
x/(-3)-8+7 = 0
-1/3*x-1 = 0 // + 1
-1/3*x = 1 // : -1/3
x = 1/(-1/3)
x = -3
x = -3
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