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2x+27=-7x-54
We move all terms to the left:
2x+27-(-7x-54)=0
We get rid of parentheses
2x+7x+54+27=0
We add all the numbers together, and all the variables
9x+81=0
We move all terms containing x to the left, all other terms to the right
9x=-81
x=-81/9
x=-9
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