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The basic principle about chemical reactions is that whatever goes in one end, will undoubtedly come out the other!

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Expand: x² + 2x + 3x +6 = 2x+4
Take (2x+4) from both sides: x²+3x+2 = 0
Facorise: (x+2)(x+1) = 0
So solutions are x=-2 and x=-1