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5x-3+x+12=x-8+4x+20
We move all terms to the left:
5x-3+x+12-(x-8+4x+20)=0
We add all the numbers together, and all the variables
5x+x-(5x+12)-3+12=0
We add all the numbers together, and all the variables
6x-(5x+12)+9=0
We get rid of parentheses
6x-5x-12+9=0
We add all the numbers together, and all the variables
x-3=0
We move all terms containing x to the left, all other terms to the right
x=3
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