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