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