Question

Rezolvati in Q ecuatiile 
x+7 supra 3= 2 supra 9
4 supra5x -3 supra 10x = -3
x supra 3+5-x supra 9-x supra 27- 2 supra 3=1 supra 9

Answer 1

$x+ \frac{7}{3} = \frac{2}{9}$

$x = \frac{2}{9} - \frac{7}{3}= \frac{2-7*3}{9}=\frac{2-21}{9}=- \frac{19}{9}$

$\frac{4}{5x}- \frac{3}{10x} = -3$

$4*2- 3 = -3*10x$
$8- 3 = -30x$
$5 = -30x$
$x= -\frac{5}{30} = -\frac{1}{6}$

$\frac{x}{3}+ \frac{5-x}{9}- \frac{x}{27} - \frac{2}{3} = \frac{1}{9}$

$9x+3(5-x)-x-2*9 = 1*3$
$9x+15-3x-x-18 = 3$
$5x-3 = 3$
$5x=3+3$
$5x=6$
$x= \frac{6}{5}$