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3.5z+6z=-30.5
We move all terms to the left:
3.5z+6z-(-30.5)=0
We add all the numbers together, and all the variables
9.5z+30.5=0
We move all terms containing z to the left, all other terms to the right
9.5z=-30.5
z=-30.5/9.5
z=-3+2/9.5
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