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cara lengkap :
a + a +2 + a +4 = 75
3a + 6 = 75
3a = 69
a = 23
23,25,27
23 +27 = 50
x= 75-6/3
x=69/3=23
jumlahnya x=23
x+2=25
x+4=27
23+27=50