3x-21=8.5

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Solution for 3x-21=8.5 equation: 



3x-21=8.5

We move all terms to the left:

3x-21-(8.5)=0

We add all the numbers together, and all the variables

3x-29.5=0

We move all terms containing x to the left, all other terms to the right

3x=29.5

x=29.5/3

x=9+2.5/3

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