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= (x+2)+ (-2) (By Associative) (+2) + (-2) = y + (2+(-2)) (uniqueness of zero) = y +0 = 9 x=y Hence the proof. et les con 고 Theonem :8.4 For each real number o, & -(-x) = x (ii) - (x+y) = (-x)+(-4) To pridef prove (1) Ty the negative 0-4 be denoted by z. ...
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