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2x+1+2x+8+4=2x+13
We move all terms to the left:
2x+1+2x+8+4-(2x+13)=0
We add all the numbers together, and all the variables
4x-(2x+13)+13=0
We get rid of parentheses
4x-2x-13+13=0
We add all the numbers together, and all the variables
2x=0
x=0/2
x=0
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