3x-8=4x-21

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Solution for 3x-8=4x-21 equation: 



3x-8=4x-21

We move all terms to the left:

3x-8-(4x-21)=0

We get rid of parentheses

3x-4x+21-8=0

We add all the numbers together, and all the variables

-1x+13=0

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

-x=-13

x=-13/-1

x=+13

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