solve the equation x1+x2-x3+x4=0; x1-x2+2x3-x4=0; 3x1+x2+x4=0
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What are infectious diseases?
Diseases which can spread from one person to another and microbes are the immediate cause for these diseases are called infectious diseases. Example, typhoidWhat are infectious diseases?
Diseases which can spread from one person to another and microbes are the immediate cause for these diseases are called infectious diseases. Example, typhoid
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