(21z+15)-(7z+15)-(7z+13)=(9z+35)-(z+9)

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Solution for (21z+15)-(7z+15)-(7z+13)=(9z+35)-(z+9) equation: 



(21z+15)-(7z+15)-(7z+13)=(9z+35)-(z+9)

We move all terms to the left:

(21z+15)-(7z+15)-(7z+13)-((9z+35)-(z+9))=0

We get rid of parentheses

21z-7z-7z-((9z+35)-(z+9))+15-15-13=0



We calculate terms in parentheses: -((9z+35)-(z+9)), so:

(9z+35)-(z+9)

We get rid of parentheses

9z-z+35-9

We add all the numbers together, and all the variables

8z+26

Back to the equation:

-(8z+26)



We add all the numbers together, and all the variables

7z-(8z+26)-13=0

We get rid of parentheses

7z-8z-26-13=0

We add all the numbers together, and all the variables

-1z-39=0

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

-z=39

z=39/-1

z=-39

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