Odpowiedź :
Szczegółowe wyjaśnienie:
A)
6x+5 = 4x
2x +5= 0
2x = -5
2x -5 = -10
2x = -5
x = -2,5
B)
9x-3 =2x +5
7x-3 = 5
7x = 8
8
x = ---------
7
a)
[tex]6x + 5 = 4x | - 4x \\ 2x + 5 = 0 | - 5 \\ 2x = - 5 | \div 2 \\ x = - 2.5[/tex]
b)
[tex]9x - 3 = 2x + 5 | - 2x \\ 7x - 3 = 5 | + 3 \\ 7x = 8 | \div 7 \\ x = \frac{8}{7} \\ x = 1 \frac{1}{7} [/tex]