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tinggi foto=48
lebar bingkai=36+3+3=42
tinggi bingkai =48+3+X=51+X
tinggi bingkai/tinggi foto=lbr bngkai/lbr foto
51+X/48=42/36
(51+X)36=42×48
1836+36X=2016
36X=2016-1836
36X=180
X=180:36
X=5
X adlh sisa karton bawah