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-3b-9b-5b-3b= -20b
10a-20b
b) 3y-6y-7y= -10y
4x+x+2x= 7x
7x-10y
c) 2x+1-5y+3-x=
2x-x= x
1+3= 4
4+x-5y
d) 2ab+5b-ab-2ab+2b-5b=
2ab-ab-2ab= -ab
5b+2b-5b= 2b