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11z+15=-2z=54
We move all terms to the left:
11z+15-(-2z)=0
We get rid of parentheses
11z+2z+15=0
We add all the numbers together, and all the variables
13z+15=0
We move all terms containing z to the left, all other terms to the right
13z=-15
z=-15/13
z=-1+2/13
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