Respuesta:
[tex]5x = 50 \\ x = \frac{50}{5} \\ x = 10[/tex]
[tex]3x + 21 = 321 \\ 3x = 321 - 21 \\ 3x = 300 \\ x = \frac{300}{3} \\ x = 100[/tex]
[tex]20x - 40 = 120 \\ 20x = 120 + 40 \\ 20x = 160 \\ x = \frac{160}{20} \\ x = 8[/tex]
[tex]13x - 100 = 1200 \\ 13x = 1200 + 100 \\ 13x = 1300 \\ x = \frac{1300}{13} \\ x = 100[/tex]
[tex]5x - 30 = 170 \\ 5x = 170 + 30 \\ 5x = 200 \\ x = \frac{200}{5} \\ x = 40[/tex]
[tex]8x + 15 = 175 \\ 8x = 175 - 15 \\ 8x = 160 \\ x = \frac{160}{8} \\ x = 20[/tex]
Explicación paso a paso:
