Odpowiedź :
3(x – 7) = 20 – 10x
3x - 21 = 20 - 10x
3x + 10x = 20 + 21
13x = 41 |:13
x = 3[tex]\frac{4}{13}[/tex]
x + 6 = 2x – 3
x - 2x = -3 - 6
-x = -9
x = 9
3(x – 7) = 20 – 10x
3x - 21 = 20 - 10x
3x + 10x = 20 + 21
13x = 41 |:13
x = 3[tex]\frac{4}{13}[/tex]
x + 6 = 2x – 3
x - 2x = -3 - 6
-x = -9
x = 9