$x^4-x^3-9x^2+3x+18$
$\left(y'+2yx=1+x^2\cdot y^2\right)$
$x^2+6x+28$
$2b^2+5b-3=0$
$2x\:-\:5\:<\:9$
$x^3+8x^2+10x=0$
$\cosh\left(-x\right)$
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