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