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Podnoszę obustronnie do kwadratu
ײ-6×+9-25-10×+ײ=4
2x²-16x-20=0 I:2
x²-8x-10=0
Δ=64+40=104
√Δ=√104
x=(-8-√104)/2 ∨ x=(-8+√104)/2