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7z+9-2z-3-6=-6+31
We move all terms to the left:
7z+9-2z-3-6-(-6+31)=0
We add all the numbers together, and all the variables
7z-2z+9-3-6-25=0
We add all the numbers together, and all the variables
5z-25=0
We move all terms containing z to the left, all other terms to the right
5z=25
z=25/5
z=5
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