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x in (-oo:+oo)
-2*x-6 = (-1/4)*x-3 // - (-1/4)*x-3
3-2*x-((-1/4)*x)-6 = 0
(1/4)*x-2*x-6+3 = 0
-7/4*x-3 = 0 // + 3
-7/4*x = 3 // : -7/4
x = 3/(-7/4)
x = -12/7
x = -12/7
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