8x+13=7x+21

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Solution for 8x+13=7x+21 equation: 



8x+13=7x+21

We move all terms to the left:

8x+13-(7x+21)=0

We get rid of parentheses

8x-7x-21+13=0

We add all the numbers together, and all the variables

x-8=0

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

x=8

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