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5x+7=-21-2xx=
We move all terms to the left:
5x+7-(-21-2xx)=0
We add all the numbers together, and all the variables
5x-(-2xx-21)+7=0
We get rid of parentheses
5x+2xx+21+7=0
We add all the numbers together, and all the variables
5x+2xx+28=0
We move all terms containing x to the left, all other terms to the right
5x+2xx=-28
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