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8+2(5x-8)=21
We move all terms to the left:
8+2(5x-8)-(21)=0
We add all the numbers together, and all the variables
2(5x-8)-13=0
We multiply parentheses
10x-16-13=0
We add all the numbers together, and all the variables
10x-29=0
We move all terms containing x to the left, all other terms to the right
10x=29
x=29/10
x=2+9/10
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