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