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x in (-oo:+oo)
(3/4)*x = (1/2)*x-4 // - (1/2)*x-4
(3/4)*x-((1/2)*x)+4 = 0
(3/4)*x+(-1/2)*x+4 = 0
1/4*x+4 = 0 // - 4
1/4*x = -4 // : 1/4
x = -4/1/4
x = -16
x = -16
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