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x(3x-7)(2x+3)=4
We move all terms to the left:
x(3x-7)(2x+3)-(4)=0
We multiply parentheses ..
x(+6x^2+9x-14x-21)-4=0
We multiply parentheses
6x^3+9x^2-14x^2-21x-4=0
We do not support expression: x^3
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