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15=7z+6
We move all terms to the left:
15-(7z+6)=0
We get rid of parentheses
-7z-6+15=0
We add all the numbers together, and all the variables
-7z+9=0
We move all terms containing z to the left, all other terms to the right
-7z=-9
z=-9/-7
z=1+2/7
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