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48=4.5z+12
We move all terms to the left:
48-(4.5z+12)=0
We get rid of parentheses
-4.5z-12+48=0
We add all the numbers together, and all the variables
-4.5z+36=0
We move all terms containing z to the left, all other terms to the right
-4.5z=-36
z=-36/-4.5
z=+8
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