Question

x - 3  -  x - 2    qual é a resposta 
  7          3

Answer 1

$\frac{x-3}{73} - \frac{x-2}{1} => x-3-73*(x-2)=0\\ x-3-73x+146=0\\-72x+143 => x= \frac{143}{72}$

Quando : $\frac{x-3}{7} - \frac{x-2}{3}$ => duas forma de resolver usando:
$(MMC:\frac{x-3}{21} - \frac{x-2}{21}) \\\\ => \frac{3x-9-7x+14}{21} =>\\ -4x+5=0\\ x= \frac{5}{4}$
ou
$3*(x-3)-7*(x-2)=0\\ 3x-9-7x+14=0 => -4x+5=0 => x= \frac{5}{4} :.$

Answer 2

$\dfrac{x - 3}{7} - \dfrac{x - 2 }{3}$

MMC de 7, 3 = 21 

$\dfrac{3x - 9 - 7x - 14}{21} =0 \\ \\ \\ 3x - 9 - 7x + 14 = 0 \\ \\ -4x = -14 + 9 *(-1)\\ \\ 4x = +14 - 9 \\ \\ 4x = 5 \\ \\ x = \dfrac{5}{4}$