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100z+260z=20+50+290
We move all terms to the left:
100z+260z-(20+50+290)=0
We add all the numbers together, and all the variables
100z+260z-360=0
We add all the numbers together, and all the variables
360z-360=0
We move all terms containing z to the left, all other terms to the right
360z=360
z=360/360
z=1
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