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x(x+1)(x+2)(x+3)=180
We move all terms to the left:
x(x+1)(x+2)(x+3)-(180)=0
We multiply parentheses ..
x(+x^2+2x+x+2)(x+3)-180=0
We move all terms containing x to the left, all other terms to the right
x(+x^2+2x+x+2)(x+3)=180
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