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