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13.9=2.52z
We move all terms to the left:
13.9-(2.52z)=0
We add all the numbers together, and all the variables
-(+2.52z)+13.9=0
We get rid of parentheses
-2.52z+13.9=0
We move all terms containing z to the left, all other terms to the right
-2.52z=-13.9
z=-13.9/-2.52
z=5+1/1.9384615384615
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