Question

se 4x/3-2x-1/4=7/18, então x=

a) 1/2
b) 4
c) 23/30
d) 1/3
e) 1/6

resposta do livro (E)
????

Answer 1

$\frac{4x}{3} - \frac{2x-1}{4} = \frac{7}{18} \to mmc = 36 \\ \\ \frac{4x}{36} - \frac{2x-1}{36} = \frac{7}{36} \\ \\ 48x - 9(2x-1) = 14 \\ 48x - 18x + 9 = 14 \\ 48x - 18x = 14 - 9 \\ 30x = 5 \\ \\ x = \frac{5}{30} = \boxed{\frac{1}{6}} \to alternativa \ E$

Answer 2

 4x/3-2x-1/4=7/18                   mmc(3,4,18) = 36

48x -9(2x-1) = 14
48x - 18x + 9 = 14
30x = 14-9
 30x = 5
     x = 5 ou  x =  1
         30             6