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7x^2x-7=21+8
We move all terms to the left:
7x^2x-7-(21+8)=0
We add all the numbers together, and all the variables
7x^2x-7-29=0
We add all the numbers together, and all the variables
7x^2x-36=0
We move all terms containing x to the left, all other terms to the right
7x^2x=36
x=36/1
x=36
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