Question

Resuelve y halla el conjunto solución:
3x + 15 ÷ 5 > 21
\(ϋ)/♩​

Answer 1

3x + 15 ÷ 5 > 21

3x > 21 - 15 x 5

3x > 6 x 5

3x > 30

x > 30 ÷ 3

x > 10

C.S. = {11, 12, 13, 14, 15, 16, 17, 18, 19, 20, ...}

Answer 2

$\frac{5(3x + 15)}{5} > 21 \times 5 = 3x + 15 > 105 \\ \\ 3x + 15 - 15 > 105 - 15 = 3x > 90 \\ \\ \frac{3x}{3} > \frac{90}{3} = x > 30$