21=16x+15x

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Solution for 21=16x+15x equation: 



21=16x+15x

We move all terms to the left:

21-(16x+15x)=0

We add all the numbers together, and all the variables

-(+31x)+21=0

We get rid of parentheses

-31x+21=0

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

-31x=-21

x=-21/-31

x=21/31

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