21=14+15+x+x

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Solution for 21=14+15+x+x equation: 



21=14+15+x+x

We move all terms to the left:

21-(14+15+x+x)=0

We add all the numbers together, and all the variables

-(2x+29)+21=0

We get rid of parentheses

-2x-29+21=0

We add all the numbers together, and all the variables

-2x-8=0

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

-2x=8

x=8/-2

x=-4

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