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18-3x-27=-9-3x
-9=-9
b) 12x-2(x+3)=3(x-5)+7x
12x-2x-6=3x-15+7x
-6=-15
sprzeczność
c) 5x-6(x+7)=8x-9(10+x)
5x-6x-42 = 8x-90-9x
-42 = -90
sprzeczność