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2x+7=-7x-11
We move all terms to the left:
2x+7-(-7x-11)=0
We get rid of parentheses
2x+7x+11+7=0
We add all the numbers together, and all the variables
9x+18=0
We move all terms containing x to the left, all other terms to the right
9x=-18
x=-18/9
x=-2
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