Answer:
a=4
Step-by-step explanation:
[tex]x+7a=47+ax-7a\\\\x+7a-7a=47+ax-7a-7a\\\\x=47+ax-14a\\\\x-47=47+ax-14a-47\\\\x-47=ax-14a\\\\x-47=a(x-14)\\\\(x-47)*\frac{1}{x-14} =a(x-14)*\frac{1}{x-14} \\\\\frac{x-47}{x-14} =a\\\\\frac{(3)-47}{(3)-14} =a\\\\\frac{-44}{-11}=a\\\\a=4[/tex]
