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