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5*(x^3+x^2+x/3)+15 = 5*(x^3+x^2)-((4*x)/3)-5 // - 5*(x^3+x^2)-((4*x)/3)-5
5*(x^3+x^2+x/3)-(5*(x^3+x^2))+(4*x)/3+5+15 = 0
5*(x^3+x^2+x/3)-5*(x^3+x^2)+(4*x)/3+5+15 = 0
5*(x^3+x^2+1/3*x)-5*(x^3+x^2)+(4*x)/3+5+15 = 0
(3*5*(x^3+x^2+1/3*x))/3+(-5*3*(x^3+x^2))/3+(4*x)/3+(3*5)/3+(3*15)/3 = 0
3*5*(x^3+x^2+1/3*x)-5*3*(x^3+x^2)+4*x+3*5+3*15 = 0
5*x+4*x+15+45 = 0
9*x+15+45 = 0
9*x+60 = 0
(9*x+60)/3 = 0
(9*x+60)/3 = 0 // * 3
9*x+60 = 0
9*x+60 = 0 // - 60
9*x = -60 // : 9
x = -60/9
x = -20/3
x = -20/3
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