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x in (-oo:+oo)
9-((3/4)*x) = 12 // - 12
9-((3/4)*x)-12 = 0
(-3/4)*x-12+9 = 0
-3/4*x-3 = 0 // + 3
-3/4*x = 3 // : -3/4
x = 3/(-3/4)
x = -4
x = -4
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