Rectangle from string

String 12m. Make rectangle when one side is two times longer than its width.

Correct result:

a =  4
b =  2

Solution:


2(a+b)=12
a = 2b

2•(a+b)=12
a = 2•b

2a+2b = 12
a-2b = 0

a = 4
b = 2

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