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31) 9y+21 =3(3y+7)
32) 14a+35b =7(2a+5b)
35) 10c+c =11c
38) 10x+25y+30 =5(2x+5y+6)
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
do this to all above examples.
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