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y in (-oo:+oo)
y = 6.625*(3/7)+4/7 // - 6.625*(3/7)+4/7
y-(6.625*(3/7))-(4/7) = 0
y-4/7-2.83928571 = 0
y-3.41071428 = 0 // + 3.41071428
y = 3.41071428
y = 3.41071428
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