5x+4x-27=81

9x - 27 = 81

9x = 81 + 27

9x = 108

x = 12

3x+x+3x+50=64

To solve the equation 5x + 4x - 27 = 81, we need to isolate the variable x on one side of the equation.

Step 1: Combine like terms.
Combine the terms with x on the left side of the equation:
5x + 4x = 9x

Step 2: Move the constant term to the right side of the equation.
To do this, add 27 to both sides of the equation:
9x - 27 + 27 = 81 + 27
9x = 108

Step 3: Solve for x.
To isolate x, divide both sides of the equation by 9:
9x/9 = 108/9
x = 12

Therefore, the solution to the equation 5x + 4x - 27 = 81 is x = 12.