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2x-9(8x+27)=21
We move all terms to the left:
2x-9(8x+27)-(21)=0
We multiply parentheses
2x-72x-243-21=0
We add all the numbers together, and all the variables
-70x-264=0
We move all terms containing x to the left, all other terms to the right
-70x=264
x=264/-70
x=-3+27/35
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