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y in (-oo:+oo)
y/30 = 6/20 // - 6/20
y/30-(6/20) = 0
y/30-3/10 = 0
1/30*y-3/10 = 0 // + 3/10
1/30*y = 3/10 // : 1/30
y = 3/10/1/30
y = 9
y = 9
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