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3x-8+8=13+8
We move all terms to the left:
3x-8+8-(13+8)=0
We add all the numbers together, and all the variables
3x-8+8-21=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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