x3+px2+qx+r=0\mathrm{x}^{3}+p \mathrm{x}^{2}+q \mathrm{x}+\mathrm{r}=0x3+px2+qx+r=0
x3+qx2+rx+p=0x^{3}+q x^{2}+r x+p=0x3+qx2+rx+p=0
rx3+qx2+px+1=0r x^{3}+q x^{2}+p x+1=0rx3+qx2+px+1=0
rx3+qx2+px−1=0\mathrm{rx}^{3}+q \mathrm{x}^{2}+\mathrm{px}-1=0rx3+qx2+px−1=0
rx3−qx3+px−1=0r x^{3}-q x^{3}+p x-1=0rx3−qx3+px−1=0