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x in (-oo:+oo)
(3/4)*(6-x) = 12 // - 12
(3/4)*(6-x)-12 = 0
3/4*(6-x)-12 = 0
3/4*(6-x)-12 = 0
-3/4*x-15/2 = 0
-3/4*x-15/2 = 0
-3/4*x-15/2 = 0 // + 15/2
-3/4*x = 15/2 // : -3/4
x = 15/2/(-3/4)
x = -10
x = -10
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