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15.8=2z-7.2
We move all terms to the left:
15.8-(2z-7.2)=0
We get rid of parentheses
-2z+7.2+15.8=0
We add all the numbers together, and all the variables
-2z+23=0
We move all terms containing z to the left, all other terms to the right
-2z=-23
z=-23/-2
z=11+1/2
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