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-2(z+7)=6
We move all terms to the left:
-2(z+7)-(6)=0
We multiply parentheses
-2z-14-6=0
We add all the numbers together, and all the variables
-2z-20=0
We move all terms containing z to the left, all other terms to the right
-2z=20
z=20/-2
z=-10
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