Question

Ajutor.A) x-1/2-3=7/2(x+3)
B)2+x-1/2=(-1/3)²-0,25,
Ps raspunsul la a trebuie sa fie -14/3 si la b -14/18

Answer 1

A)
$x-7=7x+21$$A)$
$\frac{x-1}{2}-3= \frac{7}{2}(x+3)$
Aducem ecuatia la acelasi numitor
$x-1-6=7(x+3)$

$x-7 = 7x+21$
$x-7x = 21+7$
$-6x=28$
$x= \frac{28}{-6}=- \frac{14}{3}$

B)
 2+[(x-1)/2]=(-1/3)²-0,25
$2+ \frac{x-1}{2}= \frac{1}{9}- \frac{1}{4}$
Aducem la acelasi numitor
72 +  18(x - 1)= 4 - 9
18(x - 1) = 4 - 9 - 72
18x - 18 = -73
18x = 18 - 73 
18x = -55
x = -55/18