Odpowiedź:
poziom a
c)
[tex]7 \times x - 2 - 6 \times x = 5 \\ 7x - 6x = 5 + 2 \\ x = 7[/tex]
d)
[tex]6 \times x - 4 + 4 \times x = 56 \\ 6x + 4x = 56 + 4 \\ 10x = 60 \\ x = 6[/tex]
e)
[tex]2 \times x - 3 + x = 9 \\ 2x + x = 9 + 3 \\ 3x = 12 \\ x = 4[/tex]
Poziom B
a)
[tex]6 \times x = 2 \times x - 8 \\ 6x - 2x = - 8 \\ 4x = - 8 \\ x = - 2[/tex]
b)
[tex]8 \times x = 9 + 5 \times x\\ 8x - 5x = 9 \\ 3x = 9 \\ x = 3[/tex]
c)
[tex]7 \times x = 2 \times x - 20 \\ 7x - 2x = - 20 \\ 5x = - 20 \\ x = - 4[/tex]
poziom C
b)
[tex]7 \times x - 4 = 9 + 8 \times x \\ 7x - 8x = 9 + 4 \\ - 1x = 13 \\ x = - 13[/tex]
c)
[tex] - 5 + 7 \times x = 2 \times x - 20 \\ 7x - 2x = - 20 + 5 \\ 5x = - 15 \\ x = - 3[/tex]
