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4z+1=9.
We move all terms to the left:
4z+1-(9.)=0
We add all the numbers together, and all the variables
4z+1-9=0
We add all the numbers together, and all the variables
4z-8=0
We move all terms containing z to the left, all other terms to the right
4z=8
z=8/4
z=2
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