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y in (-oo:+oo)
y/2+y/5 = 8/9 // - 8/9
y/2+y/5-(8/9) = 0
y/2+y/5-8/9 = 0
7/10*y-8/9 = 0 // + 8/9
7/10*y = 8/9 // : 7/10
y = 8/9/7/10
y = 80/63
y = 80/63
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