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4(5z-2)=0.4
We move all terms to the left:
4(5z-2)-(0.4)=0
We add all the numbers together, and all the variables
4(5z-2)-0.4=0
We multiply parentheses
20z-8-0.4=0
We add all the numbers together, and all the variables
20z-8.4=0
We move all terms containing z to the left, all other terms to the right
20z=8.4
z=8.4/20
z=1.9090909090909/4.5454545454545
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