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21+4x-12=2x+14
We move all terms to the left:
21+4x-12-(2x+14)=0
We add all the numbers together, and all the variables
4x-(2x+14)+9=0
We get rid of parentheses
4x-2x-14+9=0
We add all the numbers together, and all the variables
2x-5=0
We move all terms containing x to the left, all other terms to the right
2x=5
x=5/2
x=2+1/2
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