z+15=2z

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Solution for z+15=2z equation: 



z+15=2z

We move all terms to the left:

z+15-(2z)=0

We add all the numbers together, and all the variables

-1z+15=0

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

-z=-15

z=-15/-1

z=+15

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