a; b; c - numerele căutate.
a+b+c= 73
a= 2c
b= (a:4)+3 ⇒ b= (2c:4)+3 ⇒ b= c:2+3
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a= ?; b= ?; c= ?
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a+b+c= 73
2c+c:2+3+c= 73 /·2
4c+c+6+2c= 146
7c+6= 146
7c= 146-6
7c= 140
c= 140:7
c= 20
a= 2c
a= 2·20
a= 40
b= 20:2+3
b= 10+3
b= 13
\\weskizq
