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2014-10-22T08:47:38+03:00
7a+3b=29
4a+3a+3b=29
4a+3(a+b)=29
4a+3*7=29
4a=29-21
4a=8
a=8:4
a=2    b=7-a=7-2=5
12 4 12
2014-10-22T10:09:19+03:00
7A+3B=29
A+B=7 => A=7-B

7*(7-B)+3B=29
49-7B+3B=29
49-29=4B
B=20:4
B=5

A=7-5
A=2
6 3 6