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-4(z+3)-4(5-4z)=0
We add all the numbers together, and all the variables
-4(z+3)-4(-4z+5)=0
We multiply parentheses
-4z+16z-12-20=0
We add all the numbers together, and all the variables
12z-32=0
We move all terms containing z to the left, all other terms to the right
12z=32
z=32/12
z=2+2/3
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