-2(z+-21)=-18

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Solution for -2(z+-21)=-18 equation: 



-2(z+-21)=-18

We move all terms to the left:

-2(z+-21)-(-18)=0

We add all the numbers together, and all the variables

-2(z-21)-(-18)=0

We add all the numbers together, and all the variables

-2(z-21)+18=0

We multiply parentheses

-2z+42+18=0

We add all the numbers together, and all the variables

-2z+60=0

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

-2z=-60

z=-60/-2

z=+30

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