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15z+(4-z)=9-(2-6)
We move all terms to the left:
15z+(4-z)-(9-(2-6))=0
We add all the numbers together, and all the variables
15z+(-1z+4)-(9-(-4))=0
We add all the numbers together, and all the variables
15z+(-1z+4)-13=0
We get rid of parentheses
15z-1z+4-13=0
We add all the numbers together, and all the variables
14z-9=0
We move all terms containing z to the left, all other terms to the right
14z=9
z=9/14
z=9/14
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