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y in (-oo:+oo)
y = 8*(3/7)+4/8 // - 8*(3/7)+4/8
y-(8*(3/7))-(4/8) = 0
y-24/7-1/2 = 0
y-55/14 = 0 // + 55/14
y = 55/14
y = 55/14
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