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8a-4b-2a-2b = 6a-6b = 6( a-b )
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3a-9b-9a-9b = -6a-18b = -6( a-3b )
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x+2y-2b-8 = 1(x+2y-2b-8 ) --- nie jestem pewna czy ten przyk. jest dobrze :/ reszta powinna być ok :)
Pozdrawiam
8a-4b-2a-2b=
6a-6b
c) 3(a-3b)-9(a+b)=
3a-9b-9a-9b=
-6a-18b
d) (x+2y)-2(b+4)=
x+2y-2b-8