Question 215026
{{{r+9+7r=4(3+2r)-3}}}


Multiply and add like terms to simplify


{{{r+9+7r=4(3+2r)-3}}}


{{{8r+9=12+8r-3}}}


{{{8r+9=8r+9}}}  left side = right side or subtracting {{{8r+9}}} yields


{{{0=0}}}


I hope the above steps were helpful.


For FREE Step-By-Step videos in Introduction to Algebra, please visit http://www.FreedomUniversity.TV/courses/IntroAlgebra and for Trigonometry visit http://www.FreedomUniversity.TV/courses/Trigonometry.


Good luck in your studies!


Respectfully,
Dr J