If you mean: (2a+9)(5a-6) then it is 10a^2+33a-54
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In mathematics, the expression "2a" represents the product of 2 and the variable "a." This means that you are multiplying the number 2 by the value of the variable "a." The result will depend on the specific value assigned to the variable "a."
a + a + a - 2a = 3a - 2a = a
1/(2a)
9a +8 -2a -3 -5a = 2a +5