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