10z+21=15-2z

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Solution for 10z+21=15-2z equation: 



10z+21=15-2z

We move all terms to the left:

10z+21-(15-2z)=0

We add all the numbers together, and all the variables

10z-(-2z+15)+21=0

We get rid of parentheses

10z+2z-15+21=0

We add all the numbers together, and all the variables

12z+6=0

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

12z=-6

z=-6/12

z=-1/2

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