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z/3+7=12
We move all terms to the left:
z/3+7-(12)=0
We add all the numbers together, and all the variables
z/3-5=0
We multiply all the terms by the denominator
z-5*3=0
We add all the numbers together, and all the variables
z-15=0
We move all terms containing z to the left, all other terms to the right
z=15
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