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4z/9-3=7
We move all terms to the left:
4z/9-3-(7)=0
We add all the numbers together, and all the variables
4z/9-10=0
We multiply all the terms by the denominator
4z-10*9=0
We add all the numbers together, and all the variables
4z-90=0
We move all terms containing z to the left, all other terms to the right
4z=90
z=90/4
z=22+1/2
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