-21z=-315

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Solution for -21z=-315 equation: 



-21z=-315

We move all terms to the left:

-21z-(-315)=0

We add all the numbers together, and all the variables

-21z+315=0

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

-21z=-315

z=-315/-21

z=+15

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