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I don't understand what to put on the left lines I'm confused can anyone help?

I don't understand what to put on the left lines I'm confused can anyone help?-example-1
User BIU
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I believe you are supposed to balance the equations and write the coefficients on the lines. For example, for the top equation, the numbers would be: 2, 2, 1, 1. Hope that helps!
User ProLoser
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