27 + 20 = 47
27
20 = 400
-x + 7 = 27 Subtract 7 from both sides: -x = 20 or x = -20
3y - 7 + y + 27 = 6y + 20 - 4y Collect terms: 4y + 20 = 2y + 20 Subtract 20 4y = 2y The only way that can happen is if y = 0
20 plus 20 equals 4020 plus 20 = 40
16 plus 27 equals 43.
20 + 27 = 47
Yes.
55 + 27 + 65 = 147
27
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
74