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(6x + 6)/12 + (4x+8)/12 + (3x+9)/12 = 16
(6x+6+4x+8+3x+9)/12 = 16
13x + 23 = 16 × 12
13x + 23 = 192
13x = 192-23
13x = 169
x = 169/13
x = 13
b.13.
Caranya : 13 + 1 : 2 = 7
: 13 + 2 : 3 = 5
: 13 + 3 : 4 = 4
= 7 + 5 + 4 = 16