11 + (19 + 6) = 36
(11 + 19) + 6 = 36
So they are both equal. The brackets make no difference in this case.
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75
1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 + 11 + 12 + 13 + 14 + 15 + 16 + 17 + 18 + 19 + 20 = 210
24 + 23 + 22 + 21 + 20 + 19 + 18 + 17 + 16 + 15 + 14 + 13 + 12 + 11 + 10 + 9 + 8 + 7 + 6 + 5 + 4 + 3 + 2 + 1 = 300
-4x + 5 + 3x + 6 = -x + 11
Nine plus two equals 11 and when you add six to 11 you get 17.