[tex]3 - b = 25 \\ \\ - b = 25 - 3 \\ \\ - 1( - b) = - (22) \\ \\ \boxed{ \boxed{b = - 22 }}[/tex]
Respuesta:
3 - b = 25
3 - b - 3 = -b
25 - 3 = 22
-b = 22
[tex]\frac{-b}{-1}=\frac{22}{-1}[/tex]
[tex]\boxed{b=-22}[/tex]
Saludos...
