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(4x+21)=x
We move all terms to the left:
(4x+21)-(x)=0
We add all the numbers together, and all the variables
-1x+(4x+21)=0
We get rid of parentheses
-1x+4x+21=0
We add all the numbers together, and all the variables
3x+21=0
We move all terms containing x to the left, all other terms to the right
3x=-21
x=-21/3
x=-7
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