Question

a) 25x - 42x = 3 b) 1by + 15by = 26​

Answer 1

A)

$25x - 42x = 3$

$- 23x = 3$

$\boxed{\red{x = \frac{3}{ - 23} }}$

B)

$1by + 15by = 26$

$16by = 26$

$by = \frac{26}{16}$

$\boxed{\red{by = \frac{13}{8} }}$

Espero ter ajudado!