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7z=15-6(2-4)
We move all terms to the left:
7z-(15-6(2-4))=0
We add all the numbers together, and all the variables
7z-(15-6(-2))=0
We add all the numbers together, and all the variables
7z-27=0
We move all terms containing z to the left, all other terms to the right
7z=27
z=27/7
z=3+6/7
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