x+2x+21=45

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Solution for x+2x+21=45 equation: 



x+2x+21=45

We move all terms to the left:

x+2x+21-(45)=0

We add all the numbers together, and all the variables

3x-24=0

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

3x=24

x=24/3

x=8

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