Odpowiedź:
2-3x=4x+23
- 7x = 21
x = - 3
5 (2-3x)=65
10 - 15x = 65
- 15x = 55
[tex]x = -\frac{55}{15} = -\frac{11}{3}[/tex]
Pozostałe nie są równaniami.
a)
[tex]2-3x=4x+23\\\\-3x-4x = 23-2\\\\-7x=21 \ \ /:(-7)\\\\\boxed{x = -3}[/tex]
b)
[tex]5(2-3x) = 65 \ \ /:5\\\\2-3x = 13\\\\-3x=13-2\\\\-3x = 11 \ \ /:(-3)\\\\x = -\frac{11}{3} \\\\\boxed{x = -3\frac{2}{3}}[/tex]
c)
[tex]\frac{3x-1}{7} = 5 \ \ |\cdot7\\\\3x-1 = 35\\\\3x=35+1\\\\3x = 36 \ \ /:3\\\\\boxed{x = 12}[/tex]
