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4x+6=-3+2x+21
We move all terms to the left:
4x+6-(-3+2x+21)=0
We add all the numbers together, and all the variables
4x-(2x+18)+6=0
We get rid of parentheses
4x-2x-18+6=0
We add all the numbers together, and all the variables
2x-12=0
We move all terms containing x to the left, all other terms to the right
2x=12
x=12/2
x=6
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