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x in (-oo:+oo)
(3*x)/4 = -1/2 // + -1/2
(3*x)/4-(-1/2) = 0
(3*x)/4+1/2 = 0
3/4*x+1/2 = 0 // - 1/2
3/4*x = -1/2 // : 3/4
x = -1/2/3/4
x = -2/3
x = -2/3
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