8x+13=21x

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Solution for 8x+13=21x equation: 



8x+13=21x

We move all terms to the left:

8x+13-(21x)=0

We add all the numbers together, and all the variables

-13x+13=0

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

-13x=-13

x=-13/-13

x=1

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