$\left(10+5i\right)\left(-2+8i\right)$
$7.23+72.38$
$\:\left(4x\right)^2\:+\:2\left(4x\right)\left(4y\right)\:\:+\:\left(8y^2\right)^2$
$4x^7+2x^5-\:7x^5-7x^4-5x^3-3x^2+x+9$
$\left(x+y-z\right)^3$
$16-36n^2$
$-7d\:-\:3\:+\:3d\:-\:4d\:-\:4d$
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