Odpowiedź :
a) x + 2x = x + 9
2x = 9 / : 2
x = 4,5
b) y + 2y - 5 = 11 - y
4y = 16 / : 4
x = 4
c) 3a + 4 = a - 1 + a + 7
a = 2
d) 10 - 2b + 6 - b = 10 - b + 4 - b
-b = -2 / · (-1)
b = 2
a) x + 2x = x + 9
2x = 9 / : 2
x = 4,5
b) y + 2y - 5 = 11 - y
4y = 16 / : 4
x = 4
c) 3a + 4 = a - 1 + a + 7
a = 2
d) 10 - 2b + 6 - b = 10 - b + 4 - b
-b = -2 / · (-1)
b = 2