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iksy na lewo. liczby na prawo. odejmujemy stronami
12x-9x=10-7
3x=3
x=1
2x+12=30-3x
2x+3x=30-12
5x=18
x=5/18
3x-2=1/2x+3
3x-1/2x=3+2
2 1/2 x = 5
2.5x=5
x=2
6x-x+1=6
5x=5
x=1