Odpowiedź:
8.
8x - 5 = 9x - 5
8x - 9x = -5 + 5
-x = 0
x = 0
9.
2(x + 4) - 1 = 5x + 2
2x + 8 - 1 = 5x + 2
2x - 5x = 2 - 7
-3x = -5 /:(-3)
x = 5/3 = 1 2/3
10.
(x - 1)/2 = x + 1
1/2x - 1/2 = x + 1
1/2x - x = 1 + 1/2
-1/2x = 1 1/2 /*(-2)
x = -2 * 3/2 = -3
Szczegółowe wyjaśnienie:
2 .2(x+4)-1=5+2.
2x+8-1=5x+2.
2x-5x=2-7.
-3x= -5
x=5/3.
3 x-1/2=x+1.
x-1=2x+2.
x-2x=2+1.
-x=3.
X= - 3
