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21x+4=18x+23
We move all terms to the left:
21x+4-(18x+23)=0
We get rid of parentheses
21x-18x-23+4=0
We add all the numbers together, and all the variables
3x-19=0
We move all terms containing x to the left, all other terms to the right
3x=19
x=19/3
x=6+1/3
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