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