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3x+3=5x-4+21-3x
We move all terms to the left:
3x+3-(5x-4+21-3x)=0
We add all the numbers together, and all the variables
3x-(2x+17)+3=0
We get rid of parentheses
3x-2x-17+3=0
We add all the numbers together, and all the variables
x-14=0
We move all terms containing x to the left, all other terms to the right
x=14
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