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4z=15.2
We move all terms to the left:
4z-(15.2)=0
We add all the numbers together, and all the variables
4z-15.2=0
We move all terms containing z to the left, all other terms to the right
4z=15.2
z=15.2/4
z=3+2.6666666666667/3.3333333333333
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