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4x+7+x=21+3x
We move all terms to the left:
4x+7+x-(21+3x)=0
We add all the numbers together, and all the variables
4x+x-(3x+21)+7=0
We add all the numbers together, and all the variables
5x-(3x+21)+7=0
We get rid of parentheses
5x-3x-21+7=0
We add all the numbers together, and all the variables
2x-14=0
We move all terms containing x to the left, all other terms to the right
2x=14
x=14/2
x=7
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