Answer:
D. It introduces the conflict
7y+3=4y-18
move 4y to the other side
sign changes from +4y to -4y
7y-4y+3= 4y-4y-18
7y-4y+3= -18
3y+3= -18
move 3 to the other side
3y+3-3= -18-3
3y= -21
divide both sides by 3 to get y by itself
3y/3= -21/3
answer:
y= -7
To go someplace "on Shank's pony" (a common expression) means simply to walk there. The idiom springs from that part of the leg known as the shank, or shin, and the use of ponies for travelling.