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-8=z+6.4
We move all terms to the left:
-8-(z+6.4)=0
We get rid of parentheses
-z-6.4-8=0
We add all the numbers together, and all the variables
-1z-14.4=0
We move all terms containing z to the left, all other terms to the right
-z=14.4
z=14.4/-1
z=-14+0.4/1
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