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2x+8x=5x+8+2x+13
We move all terms to the left:
2x+8x-(5x+8+2x+13)=0
We add all the numbers together, and all the variables
2x+8x-(7x+21)=0
We add all the numbers together, and all the variables
10x-(7x+21)=0
We get rid of parentheses
10x-7x-21=0
We add all the numbers together, and all the variables
3x-21=0
We move all terms containing x to the left, all other terms to the right
3x=21
x=21/3
x=7
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