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take a^{2} , b^{2} and c^{2} common from R_{1} , R_{2} and R_{3}

then take a , b and c common from C_{1} , C_{2} and C_{3}

R_{2} --> R_{2} - R_{1}

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2

5x^{2 }+ 9y^{2} = 45

6x - 2y + 5 = 0

2 / 3

b + c