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2.5=z+8.6
We move all terms to the left:
2.5-(z+8.6)=0
We get rid of parentheses
-z-8.6+2.5=0
We add all the numbers together, and all the variables
-1z-6.1=0
We move all terms containing z to the left, all other terms to the right
-z=6.1
z=6.1/-1
z=-6+0.1/1
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