book Maths Puzzle Numerical Ability

A RECTANGULAR PIECE OF CARDBOARD IS 2 UNITS LONGER THAN IT IS WIDE. FROM EACH OF ITS CORNERS A SQUARE PIECE 2 UNITS ON A SIDE IS CUT OUT. THE FLAPS ARE THEN TURNED UP TO FORM AN

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2x+4=12
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5 I really really need help with this one

find the measure of the fourth angle of a quadrilateral when the other three angles measure 102 degrees 84 degrees and 67 degrees