Resposta:
[tex] \frac{4}{8} = \frac{2x + 1}{5x - 1} \\ \\ 4 \times (5x - 1) = 8 \times (2x +1) \\ 20x - 4 = 16x + 8 \\ 20x - 4 - 16x = 8 \\ 20x - 16x = 8 + 4 \\ 4x = 12 \div (4) \\ x = 3[/tex]
[tex]b) \: \frac{3}{4} = \frac{x}{8} \\ \\ 4x = 24 \div (4) \\ x = 6[/tex]
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Resposta:
[tex] \frac{4}{8} = \frac{2x + 1}{5x - 1} \\ \\ 4 \times (5x - 1) = 8 \times (2x +1) \\ 20x - 4 = 16x + 8 \\ 20x - 4 - 16x = 8 \\ 20x - 16x = 8 + 4 \\ 4x = 12 \div (4) \\ x = 3[/tex]
[tex]b) \: \frac{3}{4} = \frac{x}{8} \\ \\ 4x = 24 \div (4) \\ x = 6[/tex]