$3c^4+2cz$
$-7\left(-5-6\right)$
$40-\left(-3\right)$
$-2.1n-8\left(-8.7n+5.4\right)$
$-sin^2x-sin^2y+1$
$\frac{4}{3}xy+\frac{1}{6}xy$
$t^2\:+\:20t\:+\:20$
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