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(⅕x-3)²=¹/₂₅x²-⁶/₅x+9+1=x
¹/₂₅x²-¹¹/₅x+10=0/×25
x²-55x+250=0
Δ=b²-4ac=3025-1000=2025
√Δ=45
x=(55-45):2=5
x₂=(55+45):2=50
małp było 5 lub 50