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x in (-oo:+oo)
x/4+7 = x/2+5 // - x/2+5
x/4-(x/2)-5+7 = 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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