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