18=(13+z)/15

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Solution for 18=(13+z)/15 equation: 



18=(13+z)/15

We move all terms to the left:

18-((13+z)/15)=0

We add all the numbers together, and all the variables

-((z+13)/15)+18=0

We multiply all the terms by the denominator


-((z+13)+18*15)=0



We calculate terms in parentheses: -((z+13)+18*15), so:

(z+13)+18*15

We add all the numbers together, and all the variables

(z+13)+270

We get rid of parentheses

z+13+270

We add all the numbers together, and all the variables

z+283

Back to the equation:

-(z+283)



We get rid of parentheses

-z-283=0

We add all the numbers together, and all the variables

-1z-283=0

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

-z=283

z=283/-1

z=-283

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