Thank you for the opportunity to help you with your question!

31) 9y+21 =3(3y+7)

32) 14a+35b =7(2a+5b)

33)3x+21y+12z =3(x+7y+4z)

34)7m+42n=7(m+6n)

35) 10c+c =11c

36)9+21z =3(3+7z)

37)8a+6b+10c =2(4a+3b+5c)

38) 10x+25y+30 =5(2x+5y+6)

39)36+72s+4t =4(9+18s+t)

Hi, thank you so much, I would also like to know how to check with multiplication is that's possible? Thank you.

thats simple, you have to multiply factors to get the original product

31) 3(3y+7) = here multiply 3 to 3y and 7 and add

=9y+21

do this to all above examples.

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