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13(z-4)-3(z-9)-5(2+z)=0
We add all the numbers together, and all the variables
13(z-4)-3(z-9)-5(z+2)=0
We multiply parentheses
13z-3z-5z-52+27-10=0
We add all the numbers together, and all the variables
5z-35=0
We move all terms containing z to the left, all other terms to the right
5z=35
z=35/5
z=7
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