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9x^2-1-(4x^2+9)=4*(x^2+1)+(x^2-12x)-9
9x^2-1-4x^2-9=4x^2+4+x^2-12x-9
5x^2-10=5x^2-12x-5
-10=-12x-5
12x=-5+10
12x=-5
x=5\12
mam nadzieje,ze dobrze ;-)