21=8x+3=5x

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Solution for 21=8x+3=5x equation: 



21=8x+3=5x

We move all terms to the left:

21-(8x+3)=0

We get rid of parentheses

-8x-3+21=0

We add all the numbers together, and all the variables

-8x+18=0

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

-8x=-18

x=-18/-8

x=2+1/4

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