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x in (-oo:+oo)
(7/8)*x = -3/4 // + -3/4
(7/8)*x-(-3/4) = 0
(7/8)*x+3/4 = 0
7/8*x+3/4 = 0 // - 3/4
7/8*x = -3/4 // : 7/8
x = -3/4/7/8
x = -6/7
x = -6/7
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