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