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4x + 11x = 60
15x = 60
x = 60/15
x = 4
selisih
11x -4x = 7x
= 7(4)
= 28
jawabannya adaah 28
15x = 60
x = 60/15
x = 4
kelereng fais = 4(4) = 16
kelereng bayu = 11(4) = 44
selisihnya yaitu 44 - 16 = 28