a)
[tex]4x + 5 = 2x - 3 | - 5 \\ 4x = 2x - 8 | - 2x \\ 2x = - 8 | \div 2 \\ x = - 4[/tex]
b)
[tex]4x - 8 = 6 - 3x | + 8 \\ 4x = 14 - 3x | + 3x \\ 7x = 14 | \div 7 \\ x = 2[/tex]
Odpowiedź:
4x + 5 = 2x - 3 / - 5
4x + 5 - 5 = 2x -3 - 5
4x = 2x - 8/ -2x
4x - 2x = 2x - 2x - 8
2x = -8 / :2
x = -4
4x - 8 = 6 - 3x / +8
4x - 8 + 8 = 6 - 3x + 8
4x = -3x + 14 /+3x
4x + 3x = -3x + 14 + 3x
7x = 14 /:7
x = 2
Szczegółowe wyjaśnienie:
