Question

DODAWANIE I ODEJMOWANIE SUM ALGEBRAICZNYCH: 4y+(3x+2y)=
3z+8+(7-2z)=
9x-(3x+2)=
10x+7-(9-2x)=
6a+7-9b-(-9-3a)=
3bc+7a-(-4bc+8a)=
(4a-2)+(6b-9)=
-(9a+7)+(3a-6)=
-(6a+7)-(-7+16a)=
4ab-2b-(-9ab+8b)=
-(-3a-9)-(6a-5)=
(2a-7)-(5-4a)=