
Elementary Math Fractions, Percentages, Word Problems, Equations, Inequations, Factorization, Expansion 
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September 7th, 2018, 06:58 AM  #11 
Newbie Joined: Sep 2018 From: Spain Posts: 4 Thanks: 0 
Ok I've got it, proved in a more elementary way


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algebra, equations, inequality, solve, system 
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