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(4x-1)(x+3)-(2x-1)^2=26
We move all terms to the left:
(4x-1)(x+3)-(2x-1)^2-(26)=0
We multiply parentheses ..
(+4x^2+12x-1x-3)-(2x-1)^2-26=0
We get rid of parentheses
4x^2+12x-1x-(2x-1)^2-3-26=0
We add all the numbers together, and all the variables
4x^2+11x-(2x-1)^2-29=0
We move all terms containing x to the left, all other terms to the right
4x^2+11x-(2x-1)^2=29
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