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-11z-12+2=20-9z
We move all terms to the left:
-11z-12+2-(20-9z)=0
We add all the numbers together, and all the variables
-11z-(-9z+20)-12+2=0
We add all the numbers together, and all the variables
-11z-(-9z+20)-10=0
We get rid of parentheses
-11z+9z-20-10=0
We add all the numbers together, and all the variables
-2z-30=0
We move all terms containing z to the left, all other terms to the right
-2z=30
z=30/-2
z=-15
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