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x+3=3*(x-3)
x+3=3x-9
x-3x=-9-3
-2x=-12/:(-2)
x=6
odp.Jaś ma 6 lat
3(x-3)=x+3
3x -9 = x+3
2x=12
x=6
Jas ma 6 lat.
x+3=3(x-3)
x+3=3x-9
3+9=3x-x
12=2x
x=6