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x in (-oo:+oo)
(1/4)*x+7 = 2*x-3 // - 2*x-3
(1/4)*x-(2*x)+3+7 = 0
(1/4)*x-2*x+3+7 = 0
10-7/4*x = 0 // - 10
-7/4*x = -10 // : -7/4
x = -10/(-7/4)
x = 40/7
x = 40/7
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