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3z/10+9=3
We move all terms to the left:
3z/10+9-(3)=0
We add all the numbers together, and all the variables
3z/10+6=0
We multiply all the terms by the denominator
3z+6*10=0
We add all the numbers together, and all the variables
3z+60=0
We move all terms containing z to the left, all other terms to the right
3z=-60
z=-60/3
z=-20
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