Question

(x+3)sobre 2+x sobre 2 -7x

Answer 1

$\frac{(x+3)}{2} + \frac{x}{2} -7x =\frac{(x+3)}{2} + \frac{x}{2} - \frac{14x}{2} = \frac{x+3+x-14x}{2} = \frac{-12x+3}{2} = \\ = \frac{-12x}{2} + \frac{3}{2} = -6x + \frac{3}{2}$