Which equation has solution x = -3?

a)
2x - 7 = -1

b)
3x + 8 = 1

c)
1
2
x + 8 = 10
eliminate

d)
1
2
(2x - 6) = -6

Two cyclists 84 miles apart start riding toward each other at the samen time. one cycles 2 times as fast as the other. if they meet 4 hours later what is the speed (in miles) of the faster cyclists