Mixed Fraction Equality
MATL, 7 bytes
UsGXzU=

Input is a string. Output is 1 for truthy, 0 for falsey.
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Explanation
U     % Implicit input. Convert to number(s): gives a vector of two numbers
s     % Sum of that vector
G     % Push input again
Xz    % Remove spaces
U     % Convert to number
=     % Equal? Implicit display