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x in (-oo:+oo)
-((1/2)*x) = -(7/8) // + 7/8
7/8-((1/2)*x) = 0
(-1/2)*x+7/8 = 0
7/8-1/2*x = 0 // - 7/8
-1/2*x = -7/8 // : -1/2
x = -7/8/(-1/2)
x = 7/4
x = 7/4
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