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84(x-21)=782
We move all terms to the left:
84(x-21)-(782)=0
We multiply parentheses
84x-1764-782=0
We add all the numbers together, and all the variables
84x-2546=0
We move all terms containing x to the left, all other terms to the right
84x=2546
x=2546/84
x=30+13/42
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