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y in (-oo:+oo)
(3/7)*y+1/2 = 7/2 // - 7/2
(3/7)*y+1/2-(7/2) = 0
(3/7)*y+1/2-7/2 = 0
3/7*y-3 = 0 // + 3
3/7*y = 3 // : 3/7
y = 3/3/7
y = 7
y = 7
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