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x in (-oo:+oo)
(7/8)*x = -2/3 // + -2/3
(7/8)*x-(-2/3) = 0
(7/8)*x+2/3 = 0
7/8*x+2/3 = 0 // - 2/3
7/8*x = -2/3 // : 7/8
x = -2/3/7/8
x = -16/21
x = -16/21
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