z+15=5z+9=90

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Solution for z+15=5z+9=90 equation: 



z+15=5z+9=90

We move all terms to the left:

z+15-(5z+9)=0

We get rid of parentheses

z-5z-9+15=0

We add all the numbers together, and all the variables

-4z+6=0

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

-4z=-6

z=-6/-4

z=1+1/2

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