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1/2 de x= 15
x=30
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b) 2/7 de ....14......=4
2/7 de x = 4
2x=28
x=28/2=14
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c) 2/3 de .....900..........=600
2/3 de x = 600
2x=1800
x=1800/2=900
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d)4/9 de ....351.....=156
este hazlo tu