My younger sister age today is 3 times,what it will be 3 years from now subtract 3 times what her age was 3 years ago.Find her present age
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lets take sisters age as x
x =3(x+3)-3(x-3)
x=3x+9-3x+9
x=18
x =3(x+3)-3(x-3)
x=3x+9-3x+9
x=18
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