13+8x=21+4x

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Solution for 13+8x=21+4x equation: 



13+8x=21+4x

We move all terms to the left:

13+8x-(21+4x)=0

We add all the numbers together, and all the variables

8x-(4x+21)+13=0

We get rid of parentheses

8x-4x-21+13=0

We add all the numbers together, and all the variables

4x-8=0

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

4x=8

x=8/4

x=2

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