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-12.2z-13.4z=-12.2z-13.4=-179.2
We move all terms to the left:
-12.2z-13.4z-(-12.2z-13.4)=0
We add all the numbers together, and all the variables
-25.6z-(-12.2z-13.4)=0
We get rid of parentheses
-25.6z+12.2z+13.4=0
We add all the numbers together, and all the variables
-13.4z+13.4=0
We move all terms containing z to the left, all other terms to the right
-13.4z=-13.4
z=-13.4/-13.4
z=1
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