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7x^2+8+3=5x^2+2(x^2+4x+3)-3
We move all terms to the left:
7x^2+8+3-(5x^2+2(x^2+4x+3)-3)=0
We add all the numbers together, and all the variables
7x^2-(5x^2+2(x^2+4x+3)-3)+11=0
We calculate terms in parentheses: -(5x^2+2(x^2+4x+3)-3), so:We get rid of parentheses
5x^2+2(x^2+4x+3)-3
We multiply parentheses
5x^2+2x^2+8x+6-3
We add all the numbers together, and all the variables
7x^2+8x+3
Back to the equation:
-(7x^2+8x+3)
7x^2-7x^2-8x-3+11=0
We add all the numbers together, and all the variables
-8x+8=0
We move all terms containing x to the left, all other terms to the right
-8x=-8
x=-8/-8
x=1
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