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y in (-oo:+oo)
(3/10)*y = 1/5 // - 1/5
(3/10)*y-(1/5) = 0
(3/10)*y-1/5 = 0
3/10*y-1/5 = 0 // + 1/5
3/10*y = 1/5 // : 3/10
y = 1/5/3/10
y = 2/3
y = 2/3
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