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b)2a-5b+21-6a-6b= 4a-11b+21
c) 6ab^2+4,5ab^3+7,5
d)-8a^3-14a^2+2+6a^2-9a+3= -8a^3-8a^2-9a+5
Liczę na naj :)
Ps. pamiętaj, że + * + = +
+ * - = -
- + - = +