System of equations word problems
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we have two numbers numb a and numb b. According the presentation we have a+b=30 (1)

and a-b=12 (2)  we have (1)+(2)  = 2a=42 --->>>>  a=21 plugging this value to (1) we have 21+b=30 --->>>

b=30-21 = 9
by Level 5 User (13.1k points)

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