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Solve the following pair of linear equations:
(i) \( p x+q y=p-q \)
(ii) \( a x+b y=c \)
\( q x-p y=p+q \) \( b x+a y=1+c \)
(iii) \( \frac{x}{a}-\frac{y}{b}=0 \)
(iv) \( (a-b) x+(a+b) y=a^{2}-2 a b-b^{2} \). \( a x+b y=a^{2}+b^{2} \) \( (a+b)(x+y)=a^{2}+b^{2} \)
(v) \( 152 x-378 y=-74 \) \( -378 x+152 y=-604 \)
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