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-2.9+4.2z=4.6
We move all terms to the left:
-2.9+4.2z-(4.6)=0
We add all the numbers together, and all the variables
4.2z-7.5=0
We move all terms containing z to the left, all other terms to the right
4.2z=7.5
z=7.5/4.2
z=1+2.5384615384615/3.2307692307692
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