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x in (-oo:+oo)
(-3/4)*x+6 = -12 // + 12
(-3/4)*x+6+12 = 0
18-3/4*x = 0 // - 18
-3/4*x = -18 // : -3/4
x = -18/(-3/4)
x = 24
x = 24
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