Question

Me Ajudem Por Favor!
1) Sabendo que U= Q, obtenha o valor da incógnita de cada equação.

A) 2x/5 - 1/4 = X - 1/10

B) 2m - 7/5 - m/10 = 1/2

Answer 1

a)$\frac{2x}{5} - \frac{1}{4} = x - \frac{1}{10}$
$\frac{4.(2x)}{5.4} - \frac{1.5}{4.5} = \frac{20x}{20} - \frac{1.2}{10.2}$
$\frac{4.(2x)}{20} - \frac{5}{20} = \frac{20x}{20} - \frac{2}{20}$
$\frac{4.(2x)-5}{20} = \frac{20x-2}{20}$
$8x-5 = 20x-2$
$8x-20x =-2+5$
$8x-20x =-3$
$12x =-3$
$x = \frac{-3}{12} = \frac{-1}{4}$
b)$2x- \frac{7}{5}- \frac{x}{10}= \frac{1}{2}$
$\frac{2x.10}{10} - \frac{7.2}{5.2}- \frac{x}{10}= \frac{1.5}{2.5}$
$\frac{20x}{10} - \frac{14}{10}- \frac{x}{10}= \frac{5}{10}$
$20x - 14- x= 5$
$20x - x= 5 +14$
$19x=19$
$x=1$