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z-3.5z+1.2=-0.3
We move all terms to the left:
z-3.5z+1.2-(-0.3)=0
We add all the numbers together, and all the variables
-2.5z+1.5=0
We move all terms containing z to the left, all other terms to the right
-2.5z=-1.5
z=-1.5/-2.5
z=1/1.66666666667
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