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1=a
2a+3b=4ab
2+3b=4b
2=b
a dan b sudah diketahui
maka nilai b-a=2-1=1
2a - 10b = -9ab
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13b = 13ab
a = 1
2(1) + 3b = 4(1)b
2 + 3b = 4b
b = 2
b-a = 2-1 = 1