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-10z+(-3z)=13
We move all terms to the left:
-10z+(-3z)-(13)=0
We get rid of parentheses
-10z-3z-13=0
We add all the numbers together, and all the variables
-13z-13=0
We move all terms containing z to the left, all other terms to the right
-13z=13
z=13/-13
z=-1
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