Solve for z: z/2 + 1 = 9 Put each term in z/2 + 1 over the common denominator 2: z/2 + 1 = z/2 + 2/2: z/2 + 2/2 = 9 z/2 + 2/2 = (z + 2)/2: (z + 2)/2 = 9 Multiply both sides of (z + 2)/2 = 9 by 2: (2 (z + 2))/2 = 2×9 (2 (z + 2))/2 = 2/2×(z + 2) = z + 2: z + 2 = 2×9 2×9 = 18: z + 2 = 18 Subtract 2 from both sides: z + (2 - 2) = 18 - 2 2 - 2 = 0: z = 18 - 2 18 - 2 = 16: Answer: z = 16
