I think the answer would be like... The 6 in each place is worth a different amount. Like just the 6 in the tenths place is worth less than the 6 in the tens place.
Answer: subtraction property
x-(-6)=18
x+6=18
Subtract 6 from both sides
And you get x=12
If you are referring to the 5 times tables, here you go (:
5 • 1 = 5
5 • 2 = 10
5 • 3 = 15
5 • 4 = 20
5 • 5 = 25
5 • 6 = 30
5 • 7 = 35
5 • 8 = 40
5 • 9 = 45
5 • 10 = 50
5 • 11 = 55
5 • 12 = 60