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-10.2z-6.48=-13.8z
We move all terms to the left:
-10.2z-6.48-(-13.8z)=0
We get rid of parentheses
-10.2z+13.8z-6.48=0
We add all the numbers together, and all the variables
3.6z-6.48=0
We move all terms containing z to the left, all other terms to the right
3.6z=6.48
z=6.48/3.6
z=1+2.88/3.6
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