3 + 6 + 9 + 12 = 30
20 + 12 + 32 + 20 + 30 + 72 = 186
-6
61+24=85
The LCM of 12 and 30 is 60.
3 + 6 + m + 12 + 5 = 30 9 + m + 17 = 30 m + 26 = 30 m = 30 - 26 = 4
10 - 5 + 14324 + 12 + 30 - 1000 = 13371
16?
90+x+72+30 = 180. If you add 90+72+30, you get 192. But to get 180 you have to subtract 12. 90+(-12)+72+30 =180 if x is -12
4x+12-5x-30=-x-18
30 + 12 = 42, 12 + 12 = 24, I am not completely sure on the answer as the two subtractions can be taken in either order, either resulting in: 42 - 24 + 18, 18 - 12 = 6, or 24 - 12 = 12, 42 - 12 = 30.
18 + 24 - 30 = 12