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dla a= minus jedna siódma
49a²-14a=49*(-1/7)²-14*(-1/7)=49*1/49-14*(-1/7)=1+2=3
-(-48a²+10a)-(4a-a²) = 48a²-10a-4a+a²=49a²-14a
49a²-14a=49*(-1/7)²-14*(-1/7)=49*1/49-14*(-1/7)=1+2=3