Question

Ayúdenme por favor 3 ejercicios urgente¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡

Answer 1

Despejando la variable " x " :

a )

( 2 / 5 ) . ( x + 4 ) = 4
2 ( x + 4 ) = 4 . 5
2x + 8 = 20
2x = 20 - 8
2x = 12
x = 12 / 2
x = 6                 → Solución

b )

4x / 12 = x - 2
4x = 12 ( x - 2 )
4x = 12x - 2
12 x - 4x = 2
8x = 2
x = 2/8
x = 1/4          → Solución

c )

( 5x + 1 ) / 4 = x - 2
5x + 1 = 4 ( x - 2 )
5x + 1 = 4x - 8
5x - 4x = - 8 - 1
x = - 9                  → Solución