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x in (-oo:+oo)
(1/4)*x-56 = 2*x-7 // - 2*x-7
(1/4)*x-(2*x)-56+7 = 0
(1/4)*x-2*x-56+7 = 0
-7/4*x-49 = 0 // + 49
-7/4*x = 49 // : -7/4
x = 49/(-7/4)
x = -28
x = -28
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