Respuesta :

jhonyy9
first of all you need to push the restrictions for x so x not can being never equal 4 and -7 because than these denominators will be equal zero and these fractions undefined 

1/(x-4) = 2/(x+7)    cross multiple and will get 

x+7 = 2(x-4)

x+7=2x-8

x = 15

hope this helped 
caylus
Hello,

if 2/6=10/30 then 2*30=6*10 (60=60). [cross products}

[tex] \dfrac{1}{x-4} = \dfrac{2}{x+7} \\\\ If \ x \neq 4\ and\ x \neq -7\ then \\\\ 1*(x+7)=2*(x-4)\\\\ x+7=2x-8\\\\ x=15\\\\ [/tex]
Sol={15}


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