Question

na PA ( 3+X, 10-X. 3+x), a razão é?

Answer 1

$10 - x - (3 + x) \\ = 3 + x - (10 - x)$

$10 - x - 3 - x \\ = 3 + x - 10 + x$

$- x - x - x - x \\ = - 10 - 10 - 3 + 3$

$- 4x = - 20 \times ( - 1) \\ 4x = 20 \\ x = \frac{20}{4} \\ x = 5$