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x in (-oo:+oo)
x/4 = 2*x-7 // - 2*x-7
x/4-(2*x)+7 = 0
x/4-2*x+7 = 0
7-7/4*x = 0 // - 7
-7/4*x = -7 // : -7/4
x = -7/(-7/4)
x = 4
x = 4
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