3=-3(z-20)

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Solution for 3=-3(z-20) equation: 



3=-3(z-20)

We move all terms to the left:

3-(-3(z-20))=0



We calculate terms in parentheses: -(-3(z-20)), so:

-3(z-20)

We multiply parentheses

-3z+60

Back to the equation:

-(-3z+60)



We get rid of parentheses

3z-60+3=0

We add all the numbers together, and all the variables

3z-57=0

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

3z=57

z=57/3

z=19

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