How do you simplify $x/3 - x/7$ ?

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Answer 1 · 2017-10-20T10:25:53

The LCM of 3 and 7 is 21 so
$(x xx 7)/(3 xx 7) - (x xx 3)/(7 xx 3)$
$(7x)/21-(3x)/21$
$(7x-3x)/21$
$(4x)/21$

How do you simplify x/3 - x/7x/3 - x/7?