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x in (-oo:+oo)
(1/4)*x+3 = (-1/4)*x // - (-1/4)*x
(1/4)*x-((-1/4)*x)+3 = 0
(1/4)*x+(1/4)*x+3 = 0
1/2*x+3 = 0 // - 3
1/2*x = -3 // : 1/2
x = -3/1/2
x = -6
x = -6
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