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19=z/3+15
We move all terms to the left:
19-(z/3+15)=0
We get rid of parentheses
-z/3-15+19=0
We multiply all the terms by the denominator
-z-15*3+19*3=0
We add all the numbers together, and all the variables
-1z+12=0
We move all terms containing z to the left, all other terms to the right
-z=-12
z=-12/-1
z=+12
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