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y in (-oo:+oo)
y = 3.1111*(-3/7)+3 // - 3.1111*(-3/7)+3
y-(3.1111*(-3/7))-3 = 0
y-3+1.33332857 = 0
y-1.66667143 = 0 // + 1.66667143
y = 1.66667143
y = 1.66667143
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