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-9.2+4z=-18.4
We move all terms to the left:
-9.2+4z-(-18.4)=0
We add all the numbers together, and all the variables
4z+9.2=0
We move all terms containing z to the left, all other terms to the right
4z=-9.2
z=-9.2/4
z=-2+1/3.3333333333333
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