640=20(z-963)

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Solution for 640=20(z-963) equation: 



640=20(z-963)

We move all terms to the left:

640-(20(z-963))=0



We calculate terms in parentheses: -(20(z-963)), so:

20(z-963)

We multiply parentheses

20z-19260

Back to the equation:

-(20z-19260)



We get rid of parentheses

-20z+19260+640=0

We add all the numbers together, and all the variables

-20z+19900=0

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

-20z=-19900

z=-19900/-20

z=+995

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