2z+5z=7

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Solution for 2z+5z=7 equation: 



2z+5z=7

We move all terms to the left:

2z+5z-(7)=0

We add all the numbers together, and all the variables

7z-7=0

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

7z=7

z=7/7

z=1

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