Answer:
5 is your number
Explanation:
Let "a number" = x
2x + 1 = 11
Isolate the x. Note the equal sign, what you do to one side, you do to the other. Do the opposite of PEMDAS.
First, subtract 1 from both sides
2x + 1 (-1) = 11 (-1)
2x = 11 - 1
2x = 10
Next, divide 2 from both sides
(2x)/2 = (10)/2
x = 10/2
x = 5
5 is your answer
~