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(5x+7)^2-8(5x+7)+16=0
We multiply parentheses
(5x+7)^2-40x-56+16=0
We add all the numbers together, and all the variables
-40x+(5x+7)^2-40=0
We move all terms containing x to the left, all other terms to the right
-40x+(5x+7)^2=40
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