Pytania do zadania nie ma.
a)2*(-3a-4b)-3*(a+2b)+4*(2a+3b)
* to mnożenie
-6a-8b-3a-6b+8a+12b= a + 2b
-6a-8b-3a-6b+8a+12b
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-6a-8b-3a-6b+8a+12b= a + 2b
-6a-8b-3a-6b+8a+12b