name the property used 3/7 + 7/15 = 7/15 + 3/7
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3/7+7/15=7/15+3/7.
It is in the form of a+b=b+a where a=3/7 & b=7/15 which is a commutative property.
45+49/105=49+45/105. (Because LCM of 7 & 15 is 105).
94/15=94/105.
I think this is your answer.
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