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8x+27=6x-21
We move all terms to the left:
8x+27-(6x-21)=0
We get rid of parentheses
8x-6x+21+27=0
We add all the numbers together, and all the variables
2x+48=0
We move all terms containing x to the left, all other terms to the right
2x=-48
x=-48/2
x=-24
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