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a-b=3
a=3+b
16,4=2(3+b)+2b
16,4=6+2b+2b
16,4-6=4b
10,4=4b
b=2,6
a=3+2,6
a=5,6
a-b=3
a= 3+b
podstawiasz
2( 3+b) + 2b = 16,4
6+2b+2b=16,4
4b=16,4-6
4b=10,4
b=10.4 : 4
b=2,6
a= 3+2,6
a= 5,6
pozdrawiam:)