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x in (-oo:+oo)
(1/4)*x+12 = (1/2)*x+10 // - (1/2)*x+10
(1/4)*x-((1/2)*x)-10+12 = 0
(1/4)*x+(-1/2)*x-10+12 = 0
2-1/4*x = 0 // - 2
-1/4*x = -2 // : -1/4
x = -2/(-1/4)
x = 8
x = 8
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