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-2(4-z)-9(8-4z)=
We move all terms to the left:
-2(4-z)-9(8-4z)-()=0
We add all the numbers together, and all the variables
-2(-1z+4)-9(-4z+8)-()=0
We add all the numbers together, and all the variables
-2(-1z+4)-9(-4z+8)=0
We multiply parentheses
2z+36z-8-72=0
We add all the numbers together, and all the variables
38z-80=0
We move all terms containing z to the left, all other terms to the right
38z=80
z=80/38
z=2+2/19
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