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3x+9 = 2x+8 +x +1
0 = 0
b) 4( x - 2 ) - 2 ( x - 4) = 5 ( x + 1) - 3x
4x-8 -2x+8 = 5x+5 - 3x
2x=2x+5
0=5
równanie sprzeczne