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Z= -1
It is a linear equation in the variable z.
6 + z/9 = 9 Therefore, z/9 = 3 3 x 9 = 27 Therefore, z = 27
If Z = 3, then (9 + 7Z) = [ 9 + 7(3) ] = 9 + 21 = 30
6z-4z-z = 6-7-4 z = -5