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y in (-oo:+oo)
(4/7)*y+2/(-8) = -7 // + 7
(4/7)*y+2/(-8)+7 = 0
4/7*y+27/4 = 0 // - 27/4
4/7*y = -27/4 // : 4/7
y = -27/4/4/7
y = -189/16
y = -189/16
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