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x in (-oo:+oo)
(-3*x)/4-8 = 4 // - 4
(-3*x)/4-8-4 = 0
-3/4*x-12 = 0 // + 12
-3/4*x = 12 // : -3/4
x = 12/(-3/4)
x = -16
x = -16
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