\left. \begin{array} { l } { \frac { 10 } { x + y } + \frac { 2 } { x - y } = 4 } \\ { \frac { 15 } { x - y } - \frac { 5 } { x - y } = - 2 } \end{array} \right.x+y10+x−y2=4x−y15−x−y5=−2
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Photosynthesis is the process in which plants make their food by the help of sunlight water and oxygen
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