13x-5x-7=4x+21

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Solution for 13x-5x-7=4x+21 equation: 



13x-5x-7=4x+21

We move all terms to the left:

13x-5x-7-(4x+21)=0

We add all the numbers together, and all the variables

8x-(4x+21)-7=0

We get rid of parentheses

8x-4x-21-7=0

We add all the numbers together, and all the variables

4x-28=0

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

4x=28

x=28/4

x=7

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