Question 474650

If  {{{1/3 + 1/x = 1/7}}}, then the value of {{{x}}} will be:

{{{ 1/x = 1/7-1/3}}}


{{{ 1/x = 1*3/(7*3)-1*7/(3*7)}}}


{{{ 1/x = 3/21-7/21}}}


{{{ 1/x = -4/21}}}.....cross multiply


{{{ 1*21 = -4*x}}}


{{{ 21/-4 = x}}}


{{{- 5.25 = x}}}


check:


{{{1/3 + 1/x = 1/7}}}


{{{1/3 + 1/- 5.25 = 1/7}}}


{{{0.33 - 0.19 = 0.14}}}


{{{0.14 = 0.14}}}