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2x+1=3x² (przenosimy wszystko na jedną stronę):
3x²-2x-1=0
Δ=b²-4ac=(-2)²-4*3*(-1)=4+12=16
Δ=16=4
x1=(-b²- Δ):2a=(4-4):6=0
x2=(-b²+ Δ):2a=(4+4)6=8/6=4/3=1 1/3