12=4(z+18)

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Solution for 12=4(z+18) equation: 



12=4(z+18)

We move all terms to the left:

12-(4(z+18))=0



We calculate terms in parentheses: -(4(z+18)), so:

4(z+18)

We multiply parentheses

4z+72

Back to the equation:

-(4z+72)



We get rid of parentheses

-4z-72+12=0

We add all the numbers together, and all the variables

-4z-60=0

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

-4z=60

z=60/-4

z=-15

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