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y in (-oo:+oo)
(5/7)*y = -7/8 // + -7/8
(5/7)*y-(-7/8) = 0
(5/7)*y+7/8 = 0
5/7*y+7/8 = 0 // - 7/8
5/7*y = -7/8 // : 5/7
y = -7/8/5/7
y = -49/40
y = -49/40
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