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(2z)/7=-9
We move all terms to the left:
(2z)/7-(-9)=0
We add all the numbers together, and all the variables
2z/7+9=0
We multiply all the terms by the denominator
2z+9*7=0
We add all the numbers together, and all the variables
2z+63=0
We move all terms containing z to the left, all other terms to the right
2z=-63
z=-63/2
z=-31+1/2
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