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14x-21=7x-16
We move all terms to the left:
14x-21-(7x-16)=0
We get rid of parentheses
14x-7x+16-21=0
We add all the numbers together, and all the variables
7x-5=0
We move all terms containing x to the left, all other terms to the right
7x=5
x=5/7
x=5/7
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