x+3x-21=2659

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Solution for x+3x-21=2659 equation: 



x+3x-21=2659

We move all terms to the left:

x+3x-21-(2659)=0

We add all the numbers together, and all the variables

4x-2680=0

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

4x=2680

x=2680/4

x=670

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