$\left(7-6i\right)-\left(-11-3i\right)$
$\int_1^{\infty}\left(\frac{-6x^2-3}{\left(x^3+x\right)^3}\right)dx$
$50b^2-10b$
$\int\left(x\sqrt{64-4x^2}\right)dx$
$\left(23mn^7+18x\right)\left(-18x+23n^7\right)$
$0.9\:\left(1-0.9\right)$
$12x^3+x^2$
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