Question

Letra A , Qual a reposta ?!

Answer 1

$\frac{x}{2} + \frac{x}{3} - \frac{x}{4}$ = 14

mmc (2,3) 2
         (1,3)3
         (1,1)6
$\frac{x}{6}$ - $\frac{x}{4}$ =14
 mmc (6,4) 2
          (3,2)2
        (3,1)3
         (1,1)12
 $\frac{x}{12}$ = 14
x = 14 .12
x =  168    

Answer 2

$\frac{x}{2} + \frac{x}{3} - \frac{x}{4} = 14$

MMC dos denominadores é 12

$12( \frac{x}{2} + \frac{x}{3} - \frac{x}{4}) = 12 * 14$

$\frac{12x}{2} + \frac{12x}{3} - \frac{12x}{4} = 12*14$

$6x + 4x - 3x = 12*14$

$10x-3x=12*14$

$7x=12*14$

$7x = 168$

$x = \frac{168}{7}$

$x = 24$