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4z/9=15
We move all terms to the left:
4z/9-(15)=0
We multiply all the terms by the denominator
4z-15*9=0
We add all the numbers together, and all the variables
4z-135=0
We move all terms containing z to the left, all other terms to the right
4z=135
z=135/4
z=33+3/4
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