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a-0.1 = b + 6
b=0.4a
a- 0.1a = 0,4a +6
b=0,4a
0,9a - 0,4a = 6
b=0,4a
0,5a = 6
b=0,4a
a=12
b=0,4 *12
a=12
b=4,8
a=12
Wszędzie klamry, ale już nie stawiałem
0,9a=b+6
b-0,4a=0
0,9a-b = 6
b-0,4a=0
-b+0,9a=6 +
0,5a=6
a=12
a=12
b=0,4a
a=12
b=0,4*12
a=12
b=4,8