7.5z=-90

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Solution for 7.5z=-90 equation: 



7.5z=-90

We move all terms to the left:

7.5z-(-90)=0

We add all the numbers together, and all the variables

7.5z+90=0

We move all terms containing z to the left, all other terms to the right

7.5z=-90

z=-90/7.5

z=-12

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