# 4 (a+2) 8 (-7x) 12 (x+y) (with-9) *11 (8+y) *16 15 (4a-3) 7 (6a+8b) 10 (2m-3n+4r) (24x+17y-36z) *4

Andrey

116

4 (a+2) =4a +8 8 (-7x)=-56х 12(x+y) of the =12th +12u (with-9) *11=11s-99 (8+y) *16=128+16у 15(4a-3) =60а-45 7(6a+8b) =42a +56 b 10 (2m-3n+4r) =20m-30n+40r (24x+17y-36z) *4=96x+68y-144z

147

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Leonid

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