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3.5+2z=-4.3
We move all terms to the left:
3.5+2z-(-4.3)=0
We add all the numbers together, and all the variables
2z+7.8=0
We move all terms containing z to the left, all other terms to the right
2z=-7.8
z=-7.8/2
z=-3+1/1.1111111111111
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