Question

O valor de x na proporção de 3 - x /1 + x= 4/2 é:

Answer 1

$\large\boxed{\begin{array}{l}\rm\dfrac{3-x}{1+x}=\dfrac{4}{2}\\\\\rm\dfrac{3-x}{1+x}=2\\\\\rm 2+2x=3-x\\\rm 2x+x=3-2\\\rm 3x=1\\\rm x=\dfrac{1}{3} \end{array}}$