Evaluate 13-0.75w+8x13−0.75w+8x13, minus, 0, point, 75, w, plus, 8, x when w=12w=12w, equals, 12 and x=\dfrac12x= 2 1 x, equals, start fraction, 1, divided by, 2, end fraction.

For this case we have the following expression:
 13-0.75w + 8x
 We must evaluate for the following values:
 w = 12
 x = 1/2
 Substituting the values we have:
 13- 0.75 * (12) + 8 * (1/2) = 8
 
 The result after evaluating the expression is:
 8