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6x+4=x+21
We move all terms to the left:
6x+4-(x+21)=0
We get rid of parentheses
6x-x-21+4=0
We add all the numbers together, and all the variables
5x-17=0
We move all terms containing x to the left, all other terms to the right
5x=17
x=17/5
x=3+2/5
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