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x in (-oo:+oo)
(3/4)*x+12 = x+8 // - x+8
(3/4)*x-x-8+12 = 0
4-1/4*x = 0 // - 4
-1/4*x = -4 // : -1/4
x = -4/(-1/4)
x = 16
x = 16
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