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= a x 10 = 6 x15
= 10 a= 90
= a = 90 / 10
= a = 9
12 / 12 + b = 9 / 15
= 12 x 15 = 9( 12 + b)
= 180 = 108 + 9b
180 - 108 = 9b
72 = 9b
b = 8