Question

15-5(x+4)= -12-3

Answer 1

15-5(x+4)= -12-3

<=> 15-5x+20=-15

<=> 5x+20=15+15

<=> 5x+20=30

<=> 5x=30-20

<=> 5x=10

<=> x=10:5

<=> x=2.

Answer 2

15 - 5(x + 4) = -12 - 3

⇔ 15 - 5x - 20 = -15

⇔ -5x - 5 = -15

⇔ -5x = -15 + 5

⇔ -5x = -10

⇔ x = \(\dfrac{-10}{-5}\)

⇔ x = 2

Vậy x = 2

Answer 3

15-5(x+4) = -12 - 3

15-5(x+4) = -15

5(x+4) = 15-(-15)

5(x+4) = 30

x+4 = 30:5

x+4 = 6

x = 6-4

x = 2