$27+3\cdot5-16$
$0.45w-w$
$5x^3\left(6x-3\right)$
$\left(2x+\frac{2}{3}\right)^2$
$6\:sin\:4x\:sin\:5x\:$
$10x^2-11x-6$
$\left(-456\right)-\left(-621\right)$
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