3x+13=4x+21

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Solution for 3x+13=4x+21 equation: 



3x+13=4x+21

We move all terms to the left:

3x+13-(4x+21)=0

We get rid of parentheses

3x-4x-21+13=0

We add all the numbers together, and all the variables

-1x-8=0

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

-x=8

x=8/-1

x=-8

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