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y in (-oo:+oo)
y/5+y/4 = 7/5 // - 7/5
y/5+y/4-(7/5) = 0
y/5+y/4-7/5 = 0
9/20*y-7/5 = 0 // + 7/5
9/20*y = 7/5 // : 9/20
y = 7/5/9/20
y = 28/9
y = 28/9
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