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=-9z-4+3z-8y+7z-8y-2y-7 =
=z-11-18y
b) 3(b-5a_-2(3b+a) =
= 3(b-5a)-2(3b+a) - rozumem ze tu miał byc nawias;)
= 3b-15a-6b-2a =
= -3b-17a
b) 3(b-5a_-2(3b+a) = 3(b-5a)-2(3b+a) = 3b-15a-6b-2a = -3b-17a
b)3-2+b+3b+a-5a 1+4b+ 4a