Question

COMO FAZER? ME AJUDEM, POR FAVOR!​

Answer 1

Realizar o mmc entre os denominadores.

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

$\frac{6x + 4x - 3x = 168}{12}$

$6x + 4x - 3x = 168$

$10x - 3x = 168$

$7x = 168$

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

$x = 14$

$b)x + \frac{x}{2} + \frac{3x}{4} = 18$

$\frac{8x + 4x + 6x = 144}{8}$

$8x + 4x + 6x = 144$

$18x = 144$

$x = \frac{144}{18}$

$x = 8$

$c) \frac{x}{2} + \frac{x}{3} = \frac{7 + 2x}{3}$

$\frac{9x + 6x = 42 + 12x}{18}$

$9x + 6x = 42 + 12x$

$9x + 6x - 12x = 42$

$15x - 12x = 42$

$3x = 42$

$x = \frac{42}{3}$

$x = 14$

$d) \frac{3x - 2}{4} - \frac{4 - x}{2} = 2x - \frac{7x - 2}{3}$

$\frac{9x - 6 - 24 - 6x = 2x - 28x - 8}{12}$

$9x - 6 - 24 - 6x = 2x - 28x - 8$

$9x - 6x + 28x - 2x = - 8 + 6 + 24$

$37x - 8x = 30 - 8$

$29x = 22$

$x = \frac{22}{29}$