Question

1) 4 X + 3 = 21 – 2 X

2) 2 ( 2 + 2 X ) = 12

3) 6 – 5 X + 7 X = 18 – 4 X

Answer 1

Respuesta:

1) x= 3

2) x= 2

3) x= 2

Explicación paso a paso:

1) 4x + 3 = 21 - 2x comprobación

4x + 2 x = 21 - 3 4(3) + 3 = 21 - 2 (3)

6x = 18 12 + 3 = 21 - 6

x = 18 / 6 15 = 15

x = 3

2) 2(2+2x) = 12 comprobación

4 + 4x = 12 2 ( 2 + 2(2)) = 12

4x = 12 - 4 2 ( 2+ 4) = 12

4x = 8 4 + 8 = 12

x= 8/4 12 = 12

x = 2

3) 6 - 5x + 7x = 18 - 4x comprobación

6 + 2x = 18 - 4x 6 - 5 (2) + 7(2) = 18 - 4(2)

2x + 4x = 18 - 6 6 - 10 + 14 = 18 - 8

6x = 12 -4 + 14 = 10

x = 12/6 10 = 10

x= 2