21+3z=-18

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Solution for 21+3z=-18 equation: 



21+3z=-18

We move all terms to the left:

21+3z-(-18)=0

We add all the numbers together, and all the variables

3z+39=0

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

3z=-39

z=-39/3

z=-13

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