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21-7z/6=z
We move all terms to the left:
21-7z/6-(z)=0
We add all the numbers together, and all the variables
-1z-7z/6+21=0
We multiply all the terms by the denominator
-1z*6-7z+21*6=0
We add all the numbers together, and all the variables
-7z-1z*6+126=0
Wy multiply elements
-7z-6z+126=0
We add all the numbers together, and all the variables
-13z+126=0
We move all terms containing z to the left, all other terms to the right
-13z=-126
z=-126/-13
z=9+9/13
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