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x/3 + x = 4 ( x trzecich)
5 - x/2 = 2 ( x drugich )
6 + x/3 = x ( x trzecich )
x/3+x=4
x+3x=12
4x=12
x=3
5-x/2=2
x=10-4
x=6
6+x/3=x
18+x=3x
3x-x=18
2x=18
x=9
x/3+x=4 | razy 3
4x=12|:4
5-x/2=2| razy 2
10-x=4
10-4=x
6+x/3=x| razy 3
18=3x-x
2x=18|:2
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x/3+x=4
x+3x=12
4x=12
x=3
5-x/2=2
x=10-4
x=6
6+x/3=x
18+x=3x
3x-x=18
2x=18
x=9
x/3+x=4 | razy 3
x+3x=12
4x=12|:4
x=3
5-x/2=2| razy 2
10-x=4
10-4=x
x=6
6+x/3=x| razy 3
18+x=3x
18=3x-x
2x=18|:2
x=9
Licze na naj :)