Given # (b+3)/7 = (b-3)/6#, how do you prove #b = 39#?

Question

514 views around the world

You can reuse this answer
Creative Commons License

Answer 1 · 2017-10-08T21:31:45

See below.

#(b+3)/7=(6-3)/6#

#(b+3)/7-(b-3)/6=0#

Multiply through by #7# and then by #6#:

#6(b+3)-7(b-3)=0#

Multiply out the brackets:

#6b+18-7b+21=0#

#-> -b+39=0#

#-> -b=-39#

#b= 39#