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