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-9=5.7+z
We move all terms to the left:
-9-(5.7+z)=0
We add all the numbers together, and all the variables
-(z+5.7)-9=0
We get rid of parentheses
-z-5.7-9=0
We add all the numbers together, and all the variables
-1z-14.7=0
We move all terms containing z to the left, all other terms to the right
-z=14.7
z=14.7/-1
z=-14+0.7/1
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