Which equation has the least solution?
a. x+5=13
b. -6x=-30
c. x/4=18
d. x-2=-11

A) x+5=13 -- subtract 5 from both sides
x=8

B) -6x=-30 -- they're both negative so change the sign to positive
6x=30 -- divide both sides by 6
x=5

C) x/4=18 -- multiply both sides by 4
x=72

D) x-2=-11 -- add 2 to both sides
x=-9

D gives the lowest answer.