Odpowiedź :
d) 7x - 5 = 6x + 8
7x - 6x = 8 + 5
x = 13
e) 5x - 8 = 4x + 9
5x - 4x = 9 + 8
x = 17
f) 9x - 4 = 8x + 5
9x - 8x = 5 + 4
x = 9
Odpowiedź:
d)
7x - 5 = 6x +8 | +5
7x = 6x + 13 | - 6x
x = 13
e)
5x - 8 = 4x +9 |+8
5x = 4x + 17 | - 4x
× = 17
f)
9x - 4 = 8x + 5 | +4
9x = 8x + 9 | - 8x
× = 9