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-0.4z+2=4.2
We move all terms to the left:
-0.4z+2-(4.2)=0
We add all the numbers together, and all the variables
-0.4z-2.2=0
We move all terms containing z to the left, all other terms to the right
-0.4z=2.2
z=2.2/-0.4
z=-5+0.2/0.4
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