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z/7+8=4
We move all terms to the left:
z/7+8-(4)=0
We add all the numbers together, and all the variables
z/7+4=0
We multiply all the terms by the denominator
z+4*7=0
We add all the numbers together, and all the variables
z+28=0
We move all terms containing z to the left, all other terms to the right
z=-28
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