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1.100%-35%=65%
130zł-65%
xzł-100%
65x=13000zł
x=200zł
3.-2(8x+2x^+24+6x)+12-x^2=
-16x-4x^-48-12x+12-x^2=
-28x-5x^-36=
-84-225-36=-345