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(2x+3)(2x+5)(x-1)(x+2)=30
We move all terms to the left:
(2x+3)(2x+5)(x-1)(x+2)-(30)=0
We multiply parentheses ..
(+4x^2+10x+6x+15)(x-1)(x+2)-30=0
We multiply parentheses ..
(+4x^2+10x+6x+15)(+x^2+2x-1x-2)-30=0
We move all terms containing x to the left, all other terms to the right
(+4x^2+10x+6x+15)(+x^2+2x-1x-2)=30
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