z+(-2z)+3z-7z+(-5z)=20

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Solution for z+(-2z)+3z-7z+(-5z)=20 equation: 



z+(-2z)+3z-7z+(-5z)=20

We move all terms to the left:

z+(-2z)+3z-7z+(-5z)-(20)=0

We add all the numbers together, and all the variables

-3z+(-2z)+(-5z)-20=0

We get rid of parentheses

-3z-2z-5z-20=0

We add all the numbers together, and all the variables

-10z-20=0

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

-10z=20

z=20/-10

z=-2

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