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(30-2x)(14-2x)x=210
We move all terms to the left:
(30-2x)(14-2x)x-(210)=0
We add all the numbers together, and all the variables
(-2x+30)(-2x+14)x-210=0
We multiply parentheses ..
(+4x^2-28x-60x+420)x-210=0
We multiply parentheses
4x^3-28x^2-60x^2+420x-210=0
We do not support expression: x^3
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