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y in (-oo:+oo)
3*y = 9/7 // - 9/7
3*y-(9/7) = 0
3*y-9/7 = 0
3*y-9/7 = 0 // + 9/7
3*y = 9/7 // : 3
y = 9/7/3
y = 3/7
y = 3/7
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