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2a+b+2c=90.000 _
-a+b= - 20.000
a-b=20.000
2a+b+2c=90.000
3a+2b+2c=130.000 -
-a-b= - 40.000
a+b=40.000
a-b = 20.000
a+b = 40.000 -
-2b= - 20.000
b=10.000
a-b=20.000
a-10.000=20.000
a=30.000
a+2b+2c=70.000
30.000+20.000+2c=70.000
2c=70.000-50.000
2c=20.000
c=10.000