$2k^2+23k+45$
$6x+9=4x+25$
$-4x\ge-3+2x$
$2^4\cdot9^{13}$
$6^2-5\cdot6-5$
$6x^2y^2+-x^2y^2+-9x^2y^2$
$\int\:\left(a^4-r^3\right)^5\left(2r^2\right)dr$
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