$e^x\cos\left(x\right)-e^x\sin\left(x\right)$
$20+900$
$4500\cdot15$
$-x+5y=7$
$+\frac{30}{+\frac{3}{5}}$
$3x^3+6x+3$
$-16-\left(-6\right)-\left(5\right)$
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