Which equation has exactly one solution?

4x - 7 = -3(3 + 4x)
4x - 7 = 0.5 (3 + 8x)
4x - 7 = 0.5 (-14 + 8x)
-12x - 7 = -3(3 + 4x)

Last saturday, the museum box office sold 281 tickets for a total of $3,954. adults ticket cost $15, and students ticket cost $12. how many of each kind of tickets were sold?

Marcus built a model car that is 4 inches wide. what scale was used to build the car if the actual width of the car is 6 feet? a. 1 in. = 2 ftb. 1 in. = 2.5 ftc. 1 in. = 1.5 ftd. 1 ft = 1.5 in.

Find the sum of 4x^{2} -4+6 and -7^{2} +3x+1