Question

Tìm x, biết:

\(\frac{37-x}{x+13}=\frac{3}{7}\)

Answer 1

=> (37  - x) . 7 = (x + 13) . 3

259 - 7x = 3x + 39

-7x - 3x = 39 - 259

-10x = -220

x =22