(i) x+2y=-7 and 3x-2y=-1, then find the ...

(i) x+2y=-7 and 3x-2y=-1, then find the value of x.
(ii) If x+y=8 and 4y-x=2, then find the value of y.
(iii) If 3x+5y=9 and 5x+3y=7, then find the value of x+y.
(iv) If 3x-y=11 and x-3y=17, then find the value of x-y.

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