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B = 7/(2+7) x 36 = 7/9 x 36 = 252 : 9 = 28
Jadi, B-A = 28 - 8 = 8
Semoga membantu ya ^^
A : B = 2x : 7x
A + B = 36
2x + 7x = 36
9x = 36
x = 4
B - A = 7x - 2x
B - A = 5x
B - A = 5(4)
B - A = 20