divide 63 into two parts such that one part is 2/ 7 of the other
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let the two parts be x and 63 - x
2x/7 = 63 - x
2x/7 + x = 63
9x/7 = 63
x = 63*7/9
x = 49
63 - x = 14
the two parts are 14 and 49
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