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y in (-oo:+oo)
y = 6.75*(3/7)+4/7 // - 6.75*(3/7)+4/7
y-(6.75*(3/7))-(4/7) = 0
y-4/7-2.89285714 = 0
y-3.46428571 = 0 // + 3.46428571
y = 3.46428571
y = 3.46428571
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