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4z-2+4z-2+3z+3z=122
We move all terms to the left:
4z-2+4z-2+3z+3z-(122)=0
We add all the numbers together, and all the variables
14z-126=0
We move all terms containing z to the left, all other terms to the right
14z=126
z=126/14
z=9
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