9(2a -b) - 4(2a -b) - 13
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Step-by-step explanation:
18a - 9b - (8a + 4b) (-13)
18a - 9b - (8a + 4b) (-13)18a - 9b + 104a - 52b
122a - 61b = 0
122a = 61b
a/b = 61/122
a/b = 1/2
a=1
b=2
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