(7z+7)+(8z-3)=90

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Solution for (7z+7)+(8z-3)=90 equation: 



(7z+7)+(8z-3)=90

We move all terms to the left:

(7z+7)+(8z-3)-(90)=0

We get rid of parentheses

7z+8z+7-3-90=0

We add all the numbers together, and all the variables

15z-86=0

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

15z=86

z=86/15

z=5+11/15

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