3x+21=8x+31

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Solution for 3x+21=8x+31 equation: 



3x+21=8x+31

We move all terms to the left:

3x+21-(8x+31)=0

We get rid of parentheses

3x-8x-31+21=0

We add all the numbers together, and all the variables

-5x-10=0

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

-5x=10

x=10/-5

x=-2

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