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