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25.5z=-77.5
We move all terms to the left:
25.5z-(-77.5)=0
We add all the numbers together, and all the variables
25.5z+77.5=0
We move all terms containing z to the left, all other terms to the right
25.5z=-77.5
z=-77.5/25.5
z=-3+1/25.5
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