$x\left(4x-7\right)+y\left(2y+1\right)$
$-230-280$
$x^5-5x^3-6x=0$
$6m^2\left(2m-5n\right)-3m\left(6m^2+4n\right)$
$2x^2-5x-1=0$
$x^2+2x-18$
$f\left(x\right)=\ln\left(2x+6\right)$
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