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4z+2+5z+3+4z+2+5z+3=100
We move all terms to the left:
4z+2+5z+3+4z+2+5z+3-(100)=0
We add all the numbers together, and all the variables
18z-90=0
We move all terms containing z to the left, all other terms to the right
18z=90
z=90/18
z=5
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