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7+z/2=6
We move all terms to the left:
7+z/2-(6)=0
We add all the numbers together, and all the variables
z/2+1=0
We multiply all the terms by the denominator
z+1*2=0
We add all the numbers together, and all the variables
z+2=0
We move all terms containing z to the left, all other terms to the right
z=-2
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