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7a = 56
a = 8 cm
b/9 = 4/3
3b = 36
b = 36/3
b = 12
maka jika a+ b= 8 + 12 = 20
7a = 14 × 4 3b = 4 × 9
7a = 56 3b = 36
a = 56/7 b = 36/3
a = 8 b = 12
→a + b = 8 + 12 = 20