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bilangan II = b
a : b = 2 : 3 --> misal a= 2x dan b = 3x
(a+4) : (b+4) = 3 : 4
4(a+4) = 3(b+4) , dengan a = 2x , b = 3x
4(2x + 4) = 3(3x + 4)
8x + 16 = 9x + 12
8x -9x = 12 - 16
-x = - 4
x = 4
a= 2x = 2(4) = 8
b = 3x = 3(4) = 12
kedua bilangan itu 8 dan 12