How do you solve #5/(r - 9) = 8/(r + 5)#?

Jan 4, 2016

#r=97/3#

You can either multiply both sides by #(r-9)(r+5)# or simply cross-multiply to arrive at the next step:

#5(r+5)=8(r-9)#

From here, distribute and solve.

#5r+25=8r-72#

#97=3r#

#r=97/3#

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