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z/4-7=3
We move all terms to the left:
z/4-7-(3)=0
We add all the numbers together, and all the variables
z/4-10=0
We multiply all the terms by the denominator
z-10*4=0
We add all the numbers together, and all the variables
z-40=0
We move all terms containing z to the left, all other terms to the right
z=40
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