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2(7+z)=9z
We move all terms to the left:
2(7+z)-(9z)=0
We add all the numbers together, and all the variables
2(z+7)-9z=0
We add all the numbers together, and all the variables
-9z+2(z+7)=0
We multiply parentheses
-9z+2z+14=0
We add all the numbers together, and all the variables
-7z+14=0
We move all terms containing z to the left, all other terms to the right
-7z=-14
z=-14/-7
z=+2
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