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Answer:
a-3b = 20
a = 20+3b
a + b = 180
20 + 3b + b =180 ( sum angles form straight line)
20 + 4b = 180
4b = 160
b = 40
a + 40 = 180
a = 140
a = 140 b = 40
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I HAVE SOLVED IT!!!!!!!!!
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