Simplify the expression.
Please show work.

(2x + 1/2) + (9x - 6 1/2)

11x−6

Step-by-step explanation:

(2x + 1/2) + (9x - 6 1/2)

Add the two x variables. (11x) Then add 1/2-6 1/12 (-6)

11x - 6

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x=60

Step-by-step explanation:

So basically the sum of interior angle of a triangle is 180.

Add all the values and make it equal to 180.

x+3/2x+1/2x=180

Then find x

3x=180

x=180/3

x=60 degrees