Question

Tìm x biết:

3x-5/ x+4= 5/2

Answer 1

\(\frac{3x-5}{x+4}=\frac{5}{2}\)

=> 2(3x - 5) = 5(x + 4)

=> 6x - 10 = 5x + 20

=> 6x - 5x = 20 + 10

=> x = 30

Answer 2

ĐKXĐ: \(x\ne-4\)

\(\frac{3x-5}{x+4}=\frac{5}{2}\)

\(\Rightarrow5\left(x+4\right)=2\left(3x-5\right)\)

=> 5x + 20 = 6x - 10

=> x = 30

Answer 3

\(\frac{3x-5}{x+4}=\frac{5}{2}\)

\(\Rightarrow2\left(3x-5\right)=5\left(x+4\right)\)

\(\Rightarrow6x-10=5x+20\)

\(\Rightarrow6x-5x=20+10\)

\(\Rightarrow x=30\)