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5(-8+9z)=-20z-1
We move all terms to the left:
5(-8+9z)-(-20z-1)=0
We add all the numbers together, and all the variables
5(9z-8)-(-20z-1)=0
We multiply parentheses
45z-(-20z-1)-40=0
We get rid of parentheses
45z+20z+1-40=0
We add all the numbers together, and all the variables
65z-39=0
We move all terms containing z to the left, all other terms to the right
65z=39
z=39/65
z=3/5
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