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a = 9x - 5
b = 3x + 1
2a + b = 180
2(9x - 5) + 3x + 1 = 180
18x - 10 + 3x + 1 = 180
21x - 9 = 180
21x = 189
x = 9
a = 9x - 5
a = 9(9) - 5
a = 81 - 5 = 76
b = 3x + 1
b = 3(9) + 1
b = 27 + 1 = 28