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y in (-oo:+oo)
(2/7)*y+1/2 = 5/2 // - 5/2
(2/7)*y+1/2-(5/2) = 0
(2/7)*y+1/2-5/2 = 0
2/7*y-2 = 0 // + 2
2/7*y = 2 // : 2/7
y = 2/2/7
y = 7
y = 7
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