18=15+x

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Solution for 18=15+x equation: 



18=15+x

We move all terms to the left:

18-(15+x)=0

We add all the numbers together, and all the variables

-(x+15)+18=0

We get rid of parentheses

-x-15+18=0

We add all the numbers together, and all the variables

-1x+3=0

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

-x=-3

x=-3/-1

x=+3

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