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-3z-13z+4z-7z=18
We move all terms to the left:
-3z-13z+4z-7z-(18)=0
We add all the numbers together, and all the variables
-19z-18=0
We move all terms containing z to the left, all other terms to the right
-19z=18
z=18/-19
z=-18/19
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