I am not entirely sure what you mean by "3 11". If this is supposed to be a fraction, the denominators are already the same, so you just need to add the numerators.
It is: 11+(-8) = 3
11 + 5w
3x + 11 = x + 3 2x = -8 x = -4
It is: 7/8 plus 2/4 = 11/8 or 1 and 3/8
one plus one third of 8 =1 + (⅓ x 8) =1 + (⁸/₃) =³/₃ + ⁸/₃ =¹¹/₃ =11÷ 3 =3.667 or 3⅔
11
3 + 8 = 11
-5
It is: 11+(-8) = 3
8+6+(-3) =14+(-3) =11
-3
8+6+(-3) =14+(-3) =11
-11
2x + 3 + 3x = x + 11 5x + 3 = x + 11 4x + 3 = 11 4x = 8 x = (8/4) x = 2
11
11
-4m + 3 = -8 -4m = -8 -3 -4m = -11 4m = 11 m = 2.75