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2x+5=3x+21-4x-12
We move all terms to the left:
2x+5-(3x+21-4x-12)=0
We add all the numbers together, and all the variables
2x-(-1x+9)+5=0
We get rid of parentheses
2x+1x-9+5=0
We add all the numbers together, and all the variables
3x-4=0
We move all terms containing x to the left, all other terms to the right
3x=4
x=4/3
x=1+1/3
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