$x^4+3x^3+x\cdot x^2-1$
$\ln\left(x^3-2x\right)-\ln\left(x\right)=\ln\left(2\right)$
$a^4-b^4$
$3a^2+5x;a=-2,x=6$
$3xy+9x-3xy-2$
$x^2+4x-7=0$
$\int\frac{x+4}{x\left(x+3\right)^2}dx$
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