90=2(7+z)

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Solution for 90=2(7+z) equation: 



90=2(7+z)

We move all terms to the left:

90-(2(7+z))=0

We add all the numbers together, and all the variables

-(2(z+7))+90=0



We calculate terms in parentheses: -(2(z+7)), so:

2(z+7)

We multiply parentheses

2z+14

Back to the equation:

-(2z+14)



We get rid of parentheses

-2z-14+90=0

We add all the numbers together, and all the variables

-2z+76=0

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

-2z=-76

z=-76/-2

z=+38

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