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y in (-oo:+oo)
3*y = 9/10 // - 9/10
3*y-(9/10) = 0
3*y-9/10 = 0
3*y-9/10 = 0 // + 9/10
3*y = 9/10 // : 3
y = 9/10/3
y = 3/10
y = 3/10
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