What us the solution to the following equation? 3(7 + 2x) + 3 = 3(5 + x) - 9(x + 1) A. 3/2 B. 2/3 C. -2/3 D. -3/2

-3/2

Step-by-step explanation:

3(7+2x)+3=3(5+X)-9(X+1)

open the bracket

21+6x+3=15+3x-9x-9

collect like terms

21+3+9-15=-6x+3x-9x

re-arrange

6x-3x+9x=+15-9-21

12x=-18

X=-18/12

break down Into smallest units

X=-18/12=-9/6=-6/2

X=-3/2

hope the working is right and the answer too!

right

step-by-step explanation:

54 km / hours

step-by-step explanation:

we need to convert seconds to hours

60 seconds = 1 minutes

60 minutes = 1hour

15 m         60 second   60 minutes

  * *         = 54000 meters/ hour

second     1 minute             1 hour

now we need to convert meters to km

1000 m = 1 km

54000 m       1 km

*   = 54 km / hours

hour               1000m