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8x+13=5x+17+x+21
We move all terms to the left:
8x+13-(5x+17+x+21)=0
We add all the numbers together, and all the variables
8x-(6x+38)+13=0
We get rid of parentheses
8x-6x-38+13=0
We add all the numbers together, and all the variables
2x-25=0
We move all terms containing x to the left, all other terms to the right
2x=25
x=25/2
x=12+1/2
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