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2014-09-21T17:14:18+03:00
A+b+c+d=103
a=c+3
b=2a
d=b-2
c+3+2x(c+3)+c+2x(c+3)-2=103
c+3+2c+6+c+2c+6-2=103
6c+13=103
6c=103-13
c=90:6
c=15
a=15+3
a=18
b=2x18
b=36
d=36-2
d=34
proba
18+36+15+34=103
2 5 2