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100z+100=200z-500
We move all terms to the left:
100z+100-(200z-500)=0
We get rid of parentheses
100z-200z+500+100=0
We add all the numbers together, and all the variables
-100z+600=0
We move all terms containing z to the left, all other terms to the right
-100z=-600
z=-600/-100
z=+6
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