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2(14x-21)=84
We move all terms to the left:
2(14x-21)-(84)=0
We multiply parentheses
28x-42-84=0
We add all the numbers together, and all the variables
28x-126=0
We move all terms containing x to the left, all other terms to the right
28x=126
x=126/28
x=4+1/2
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