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4x-3=21-4x
We move all terms to the left:
4x-3-(21-4x)=0
We add all the numbers together, and all the variables
4x-(-4x+21)-3=0
We get rid of parentheses
4x+4x-21-3=0
We add all the numbers together, and all the variables
8x-24=0
We move all terms containing x to the left, all other terms to the right
8x=24
x=24/8
x=3
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