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