-12=-4(z-15)

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Solution for -12=-4(z-15) equation: 



-12=-4(z-15)

We move all terms to the left:

-12-(-4(z-15))=0



We calculate terms in parentheses: -(-4(z-15)), so:

-4(z-15)

We multiply parentheses

-4z+60

Back to the equation:

-(-4z+60)



We get rid of parentheses

4z-60-12=0

We add all the numbers together, and all the variables

4z-72=0

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

4z=72

z=72/4

z=18

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