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1.4z-6=2.8z+9
We move all terms to the left:
1.4z-6-(2.8z+9)=0
We get rid of parentheses
1.4z-2.8z-9-6=0
We add all the numbers together, and all the variables
-1.4z-15=0
We move all terms containing z to the left, all other terms to the right
-1.4z=15
z=15/-1.4
z=-10+1/1.4
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