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y in (-oo:+oo)
(2/7)*y+8 = 11 // - 11
(2/7)*y-11+8 = 0
2/7*y-3 = 0 // + 3
2/7*y = 3 // : 2/7
y = 3/2/7
y = 21/2
y = 21/2
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