Odpowiedź:
a)
1 - (2x + 5)/3 = 4
1 - 2/3x - 5/3 = 4
-2/3x = 4 - 1 + 1 2/3
-2/3x = 4 2/3 /*(-3/2)
x = -14/3 * 3/2 = -7
b)
(x + 3)/9 - 1 = (1 - x)/3
1/9x + 1/3 - 1 = 1/3 - 1/3x
1/9x + 1/3x = 1/3 + 2/3
1/9x + 3/9x = 3/3
4/9x = 1 /*9/4
x = 9/4 = 2 1/4
c)
(2x + 3)/5 = (2 - x)/3 + x
2/5x + 3/5 = 2/3 - 1/3x + x
2/5x - 2/3x = 2/3 - 3/5
6/15x - 10/15x = 10/15 - 9/15
-4/15x = 1/15 /*(-15/4)
x = -15/4 * 1/15 = -1/4
Szczegółowe wyjaśnienie:
