Algebra - Ch. 35: Systems of of Linear Eq. in 3 Variables (20 of 25) Word Prob. Ex 2: Reduced Row E

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We will solve the following Word Problem Ex. 2 using the REDUCED ROW ECHELON FORM:
Find 3 numbers, such that, the difference of the 1st and 2nd number equals -1. The sum of the 2nd number and 3 times the 3rd number equals number. The difference of twice the 1st and 3rd number is -7.
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