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y in (-oo:+oo)
3*y = (1/2)*y+20 // - (1/2)*y+20
3*y-((1/2)*y)-20 = 0
3*y+(-1/2)*y-20 = 0
5/2*y-20 = 0 // + 20
5/2*y = 20 // : 5/2
y = 20/5/2
y = 8
y = 8
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