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(100 - V1)/4 + (50 - V1)/2 + (V2 - V1)/5 + ((V2 + 90) - V1)/10 =0,(V2 - V1)/5 + ((V2 + 90) - V1)/10 + (V2 - 80)/3 + (V2 - 60)/8 =0
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