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3x-4x=4
-x=4 /-1
x=-4
3x+9=-3x+9
3x+3x=9-9
6x=0 zadanie nie ma rozwiazania
82x-9=-18x+1
82x+18x=1+9
100x=10 /100
x=1/10
-27x+1=2x+59
-27x-2x=59-1
-29x=58 /(-29)
x=-58/29