215=-7(7z-1)-3z

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Solution for 215=-7(7z-1)-3z equation: 



215=-7(7z-1)-3z

We move all terms to the left:

215-(-7(7z-1)-3z)=0



We calculate terms in parentheses: -(-7(7z-1)-3z), so:

-7(7z-1)-3z

We add all the numbers together, and all the variables

-3z-7(7z-1)

We multiply parentheses

-3z-49z+7

We add all the numbers together, and all the variables

-52z+7

Back to the equation:

-(-52z+7)



We get rid of parentheses

52z-7+215=0

We add all the numbers together, and all the variables

52z+208=0

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

52z=-208

z=-208/52

z=-4

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