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x in (-oo:+oo)
(1/4)*x+x+8+12 = 3*x // - 3*x
(1/4)*x+x-(3*x)+8+12 = 0
(1/4)*x+x-3*x+8+12 = 0
20-7/4*x = 0 // - 20
-7/4*x = -20 // : -7/4
x = -20/(-7/4)
x = 80/7
x = 80/7
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