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Exercise 2.2 (Solutions)

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v) $ab = ba$ ... ... ... * (vi) $a + c = b + c \Rightarrow a = b$ ... ... ... * (vii) $5 + (-5) = 0$ ... .... mes \frac{1}{7} = 1$ ... ... ... * (ix) $a > b \Rightarrow ac > bc? (c >0)$ ... ... ... **Solution**\\ *... ve w.r.t multiplicative) * (vi) $a + c = b + c \Rightarrow a = b$ ... ... ... (Cancellation property of add... . ... (Multiplicative inverse) * (ix) $a > b \Rightarrow ac > bc?(c >0)$ ... ... ... (Multiplicative prop