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2x+99=-7x-9
We move all terms to the left:
2x+99-(-7x-9)=0
We get rid of parentheses
2x+7x+9+99=0
We add all the numbers together, and all the variables
9x+108=0
We move all terms containing x to the left, all other terms to the right
9x=-108
x=-108/9
x=-12
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