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(x)(x)-2(x)(x)=x(2-2x)-4
We move all terms to the left:
(x)(x)-2(x)(x)-(x(2-2x)-4)=0
We add all the numbers together, and all the variables
xx-2xx-(x(-2x+2)-4)=0
We calculate terms in parentheses: -(x(-2x+2)-4), so:We get rid of parentheses
x(-2x+2)-4
We multiply parentheses
-2x^2+2x-4
Back to the equation:
-(-2x^2+2x-4)
2x^2-2x+xx-2xx+4=0
We move all terms containing x to the left, all other terms to the right
2x^2-2x+xx-2xx=-4
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