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5. 6x + 4 + 5x + 9 = 90

11x + 13 = 90

11x = 90 – 13

11x = 77

x = 11

6. 3x + 5x + 20 = 180

8x = 180 – 20

8x = 160

x = 20

7. 2x + 3x + 85 = 180

5x = 180 – 85

5x = 95

x = 19