-3=2z+1

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Solution for -3=2z+1 equation: 



-3=2z+1

We move all terms to the left:

-3-(2z+1)=0

We get rid of parentheses

-2z-1-3=0

We add all the numbers together, and all the variables

-2z-4=0

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

-2z=4

z=4/-2

z=-2

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