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7-3z=-9z+19
We move all terms to the left:
7-3z-(-9z+19)=0
We get rid of parentheses
-3z+9z-19+7=0
We add all the numbers together, and all the variables
6z-12=0
We move all terms containing z to the left, all other terms to the right
6z=12
z=12/6
z=2
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