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b) 3x-y+1-x+y=2x+1
d)2a+a+3-3ab+a-3=4a+3-3ab
CHYBA TAK :)
-2a+4b=2(-a+2b)
b)(3x-y+1)-(x-y)=3x-y+1-x+y=2x+1
c)(2a+a+3)-(3ab-a+3)=2a+a+3-3ab+a-3=4a-3ab=a(4-3b)