6+N3 is the sum of N*3 then you add six. 6*N3 is you multiply 6 times three times N times three.
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It could be 37. Use Un = (n4 - 6n3 + 18n2 - 18n + 168)/24 with n = 6
Indeed, these two equations are the same - because addition is a commutative function.
-6 + 8 is the same as 8 - 6 is 2
-6 + -6 is the same as -6 - 6, so N = -12