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