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18a*b*b=18ab
18b=18
b=1
a=1
2)
-xf -4a-6ab= a(4-6b)-xf
3)
3x-y+1-x-y+y-x=x-y+1
2x-y+1=x-y+1
x=0
y nalezy do R
4)
2ab+a+3-3-3ab+a-3=-ab+2a
3ab+a-3ab+a-3=2a
BRAK ROZWIAZAN
5)
abc-(abc-(xyz-xyz+abc))=abc-(abc+xyz+xyz-abc)=abc-abc-xyz-xyz+abc=abc-2xyz
abc-2xyz
6)
6x-24-2=6x-26
7)
5x-5y-5-4x-8=x-5y-13
8)
5x-5y-5-4x-8=x-5y-13
9)
5a²-15a-3a²+15a=21²
2a^2=21^2
2a^2=441
a=21