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(3w+4)^2-w(3w+4)=66
We move all terms to the left:
(3w+4)^2-w(3w+4)-(66)=0
We multiply parentheses
-3w^2+(3w+4)^2-4w-66=0
We add all the numbers together, and all the variables
-3w^2-4w+(3w+4)^2-66=0
We move all terms containing w to the left, all other terms to the right
-3w^2-4w+(3w+4)^2=66
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