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x in (-oo:+oo)
(1/4)*x+3 = (3/4)*x-7 // - (3/4)*x-7
(1/4)*x-((3/4)*x)+3+7 = 0
(1/4)*x+(-3/4)*x+3+7 = 0
10-1/2*x = 0 // - 10
-1/2*x = -10 // : -1/2
x = -10/(-1/2)
x = 20
x = 20
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