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5+3x=20+x+3
We move all terms to the left:
5+3x-(20+x+3)=0
We add all the numbers together, and all the variables
3x-(x+23)+5=0
We get rid of parentheses
3x-x-23+5=0
We add all the numbers together, and all the variables
2x-18=0
We move all terms containing x to the left, all other terms to the right
2x=18
x=18/2
x=9
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