$x^2+9x<-20$
$2 x ^ { 3 } - 6 x + 4$
$7.76+1.26-0.68$
$3^{4\:}\cdot\:7^4$
$-5\cdot\left(x^4-x^3+12x^2+8x+5\right)$
$2x^2+4x-2.5$
$\int\left(5x+4x\right)^2\left(15x^2+4\right)dx$
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