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-0.7z=-4.9
We move all terms to the left:
-0.7z-(-4.9)=0
We add all the numbers together, and all the variables
-0.7z+4.9=0
We move all terms containing z to the left, all other terms to the right
-0.7z=-4.9
z=-4.9/-0.7
z=7+8.881784197E-16/0.7
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