(x+1)^3=x^3+61
x^3+3x^2+3x+1=x^3+61
3x^2+3x-60=0
x=4
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(x+1)^3=x^3+61
x^3+3x^2+3x+1=x^3+61
3x^2+3x-60=0
x=4