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x in (-oo:+oo)
x/4-(1/8) = -7/8 // + -7/8
x/4-(1/8)-(-7/8) = 0
x/4-1/8+7/8 = 0
1/4*x+3/4 = 0 // - 3/4
1/4*x = -3/4 // : 1/4
x = -3/4/1/4
x = -3
x = -3
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