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.
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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