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13d = 65. maka d = 5
2. 130 + 2e - 12 = 180
2e = 38. maka, e = 19
3. 3a + 45 = 180
3a = 135. maka, a = 45
4. 4b + 160 = 180
4b = 20. maka, b= 5
maaf jawabannya acak