10=7+z

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Solution for 10=7+z equation: 



10=7+z

We move all terms to the left:

10-(7+z)=0

We add all the numbers together, and all the variables

-(z+7)+10=0

We get rid of parentheses

-z-7+10=0

We add all the numbers together, and all the variables

-1z+3=0

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

-z=-3

z=-3/-1

z=+3

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