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x in (-oo:+oo)
(7/8)*x = -21/64 // + -21/64
(7/8)*x-(-21/64) = 0
(7/8)*x+21/64 = 0
7/8*x+21/64 = 0 // - 21/64
7/8*x = -21/64 // : 7/8
x = -21/64/7/8
x = -3/8
x = -3/8
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