2z-30=4z-90

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Solution for 2z-30=4z-90 equation: 



2z-30=4z-90

We move all terms to the left:

2z-30-(4z-90)=0

We get rid of parentheses

2z-4z+90-30=0

We add all the numbers together, and all the variables

-2z+60=0

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

-2z=-60

z=-60/-2

z=+30

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