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3A = 7B
3A : 3 = 7B : 3
A = 7/3 B
7/3 B + B = 90
7/3 B + 3/3 B = 90
10/3 B = 90
10/3 X 3 X B = 90 X 3
10B = 270
B = 270 : 10
B = 27
maka besar sudut B = 27