Ten z plus one, or ten z plus ten. That depends on where you had parentheses in the original expression: (10 * z) +1 = 10z + 1
10 * (z + 1) = 10z + 10
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z = -80
I assume you are asking: z + 2 = 12Then z would be 12-2=10
9z-5z = 30+z 3z = 30 z = 10
It's 9z-7. because: you do the 8 times z first (8z) then add the z, (9z), then minus 7. 9z-7
6z + 28 = 12z + 10 18 = 6z 3 = z