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9=19+z
We move all terms to the left:
9-(19+z)=0
We add all the numbers together, and all the variables
-(z+19)+9=0
We get rid of parentheses
-z-19+9=0
We add all the numbers together, and all the variables
-1z-10=0
We move all terms containing z to the left, all other terms to the right
-z=10
z=10/-1
z=-10
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