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z+z-20+2z-42+2z-39+2z-50+2z-29=360
We move all terms to the left:
z+z-20+2z-42+2z-39+2z-50+2z-29-(360)=0
We add all the numbers together, and all the variables
10z-540=0
We move all terms containing z to the left, all other terms to the right
10z=540
z=540/10
z=54
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