20 = 400
38 +what=57
x equals 19
10 + 9 = 19 19 - 6 = 13
48
12 + 16 + 18 + 20 + 9 = 75
19
No, because 9+10 = 19
9 - - 6 + 20 = 35
20 + 7 7 + 20 8 + 19 19 + 8 9 + 18 18 + 9 10 + 17 17 + 10 11 + 16 16 + 11 15 + 12 12 + 15 14 + 13 13 +14
-19 + 9 = -10n = -19n+9=-10-9 -9n=-19
2a + 9 = 4a - 19 9 + 19 = 4a - 2a 28 = 2a a = 14