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10+21x=98+7x-4
We move all terms to the left:
10+21x-(98+7x-4)=0
We add all the numbers together, and all the variables
21x-(7x+94)+10=0
We get rid of parentheses
21x-7x-94+10=0
We add all the numbers together, and all the variables
14x-84=0
We move all terms containing x to the left, all other terms to the right
14x=84
x=84/14
x=6
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