20=5+z+7+z

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Solution for 20=5+z+7+z equation: 



20=5+z+7+z

We move all terms to the left:

20-(5+z+7+z)=0

We add all the numbers together, and all the variables

-(2z+12)+20=0

We get rid of parentheses

-2z-12+20=0

We add all the numbers together, and all the variables

-2z+8=0

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

-2z=-8

z=-8/-2

z=+4

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