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7(3-x)+21=42-7x
We move all terms to the left:
7(3-x)+21-(42-7x)=0
We add all the numbers together, and all the variables
7(-1x+3)-(-7x+42)+21=0
We multiply parentheses
-7x-(-7x+42)+21+21=0
We get rid of parentheses
-7x+7x-42+21+21=0
We add all the numbers together, and all the variables
=0
x=0/1
x=0
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