Two groups of robbers left the bank at the same time. One group of robbers drove 1 vans and 6 cars that traveled at a total of 372
kph. The second group drove 4 vans and 12 cars and traveled at a
total of 780 kph. Every van and every car drove the same speed.
What speed did the vanš drive at? What speed did the cars drive at?

your answer would be 12

option 3 . (5x + 1) - (-10x + 6)

step-by-step explanation:

option 1 :

(4x + 3) + (-9x + 4)

or 4x+3 -9x + 4

or -5x + 7

option 2

(x - 2) - (6x - 9)

or x-2-6x + 9

or -5x + 7

option 3

(5x+ + 6)

or 5x + 1 + 10x -6

or 15x -5

option 4

-4x+2x+7-3x

-7x + 2x + 7

-5x + 7

hence only option 3 did   not satisfy the given simplify expression.