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-2m+2m=5-9
0=-4
równanie sprzeczne
b) 3x+5-7x=2-4x+3
-4x+4x=5-5
0=0
równanie tożsamościowe
c) x-4+9-6x=6x-6
-5x-6x=-6+5
-11x-1 /:-11
x=
d) 10n-3-2n=3n-13+2n
8n-5n=-13+3
3n=-10 /:3
n=-3