Find the values (x+y) and (x-y) :67x+108y=-417;108x+67y=-458
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add two eqns you'll get 67(x+y)+108(x+y)=-875 take x+y as common u get x+y = -875/175=-5 and subtract two eqns you'll get 67(x-y)+108(y-x)=-41 then take x-y as common u get x-y as -1
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