How do you solve 1/2 = 1/4 + 1/r + 1/3 ?

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Answer 1 · 2018-06-06T12:19:46

#r=-12#

Writing
#1/2-1/4-1/3=1/r#
this is
#(6-3-4)/12=1/r#
#-1/12=1/r#
so #r=-12#

Answer 2 · 2018-06-06T12:21:48

By arranging the equation

#1/2 =1/4 + 1/r + 1/3#

Collect numbers on one side:

#1/2 - 1/4 - 1/3 = 1/r#

#6/12 - 3/12 - 4/12 = 1/r#

#-1/12 = 1/r#

#-r=12#

#r=12#