20=-5(-3z-10)

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Solution for 20=-5(-3z-10) equation: 



20=-5(-3z-10)

We move all terms to the left:

20-(-5(-3z-10))=0



We calculate terms in parentheses: -(-5(-3z-10)), so:

-5(-3z-10)

We multiply parentheses

15z+50

Back to the equation:

-(15z+50)



We get rid of parentheses

-15z-50+20=0

We add all the numbers together, and all the variables

-15z-30=0

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

-15z=30

z=30/-15

z=-2

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