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