20=10(4+z)

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Solution for 20=10(4+z) equation: 



20=10(4+z)

We move all terms to the left:

20-(10(4+z))=0

We add all the numbers together, and all the variables

-(10(z+4))+20=0



We calculate terms in parentheses: -(10(z+4)), so:

10(z+4)

We multiply parentheses

10z+40

Back to the equation:

-(10z+40)



We get rid of parentheses

-10z-40+20=0

We add all the numbers together, and all the variables

-10z-20=0

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

-10z=20

z=20/-10

z=-2

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