40=20(z-970)

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Solution for 40=20(z-970) equation: 



40=20(z-970)

We move all terms to the left:

40-(20(z-970))=0



We calculate terms in parentheses: -(20(z-970)), so:

20(z-970)

We multiply parentheses

20z-19400

Back to the equation:

-(20z-19400)



We get rid of parentheses

-20z+19400+40=0

We add all the numbers together, and all the variables

-20z+19440=0

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

-20z=-19440

z=-19440/-20

z=+972

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