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(5x+7)^2+3(5x+7)=9
We move all terms to the left:
(5x+7)^2+3(5x+7)-(9)=0
We multiply parentheses
(5x+7)^2+15x+21-9=0
We add all the numbers together, and all the variables
15x+(5x+7)^2+12=0
We move all terms containing x to the left, all other terms to the right
15x+(5x+7)^2=-12
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