x+3x=8+13

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Solution for x+3x=8+13 equation: 



x+3x=8+13

We move all terms to the left:

x+3x-(8+13)=0

We add all the numbers together, and all the variables

x+3x-21=0

We add all the numbers together, and all the variables

4x-21=0

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

4x=21

x=21/4

x=5+1/4

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