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x in (-oo:+oo)
x/4 = x/2-50 // - x/2-50
x/4-(x/2)+50 = 0
50-1/4*x = 0 // - 50
-1/4*x = -50 // : -1/4
x = -50/(-1/4)
x = 200
x = 200
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