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-7.5z-7.9=-7.2
We move all terms to the left:
-7.5z-7.9-(-7.2)=0
We add all the numbers together, and all the variables
-7.5z-0.7=0
We move all terms containing z to the left, all other terms to the right
-7.5z=0.7
z=0.7/-7.5
z=-0.7/7.5
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