It means convert the value of 12 from a number system based on 10 (our usual counting system) to a number system based on 5.
In base 5 you would count to 12 this way:
1
2
3
4
10
11
12
13
14
20
21
22
Perhaps you have been learning a conversion formula. That should give you the same answer.
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- 5m + 12 = - 9 subtract 12 from each side - 5m + 12 - 12 = - 9 - 12 - 5m = - 21 divide both sides integers by - 5 (- 5/- 5)m = - 21/- 5 m = 21/5 -----------------------check in original equation = 5(21/5) + 12 = - 9 - 105/5 + 12 = = 9 (now, 12 = 60/5 , so) - 105/5 + 60/5 = - 9 - 45/5 = - 9 - 9 = - 9 ----------------checks
12 x 5 = 60 That's because 12 x 100 = 600 12/2 = 6
5/12 qt = 5/6 pints.
-6y + 5 = -67y=12-6y = -72-y = -12y = 12
-5x + 13 = -12 -5x = -12 - 13 = -25 x = -25/-5 = 5