21=3+4x+5x

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Solution for 21=3+4x+5x equation: 



21=3+4x+5x

We move all terms to the left:

21-(3+4x+5x)=0

We add all the numbers together, and all the variables

-(9x+3)+21=0

We get rid of parentheses

-9x-3+21=0

We add all the numbers together, and all the variables

-9x+18=0

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

-9x=-18

x=-18/-9

x=+2

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