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x in (-oo:+oo)
12-((3/4)*x) = 4 // - 4
12-((3/4)*x)-4 = 0
(-3/4)*x-4+12 = 0
8-3/4*x = 0 // - 8
-3/4*x = -8 // : -3/4
x = -8/(-3/4)
x = 32/3
x = 32/3
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