Odpowiedź :
a)
x + 3 = 2x
x - 2x = -3
-x = -3 /:(-1)
x = 3
b)
3x = x + 16
3x - x = 16
2x = 16 /:2
x = 8
c)
4x - 20 = 8
4x = 8 + 20
4x = 28 /:4
x = 7
a)
x + 3 = 2x
x - 2x = -3
-x = -3 /:(-1)
x = 3
b)
3x = x + 16
3x - x = 16
2x = 16 /:2
x = 8
c)
4x - 20 = 8
4x = 8 + 20
4x = 28 /:4
x = 7