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X^2-10x+25=x^2+15
X^2 się skróci
-10x=-10
x=1
b)
-(2a-5)^2=(1-2a)(1+2a)
-(4a^2-20a+25)=1-4a^2
-4a^2+20a-25=1-4a^2
-4a^2 się skróci
20a=26
a=26/20=1 i 3/10