x-3x+21=31

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



x-3x+21=31

We move all terms to the left:

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

We add all the numbers together, and all the variables

-2x-10=0

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

-2x=10

x=10/-2

x=-5

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