$x^2-5x+16$
$15a^2-8a^2+a$
$\frac{8}{11}b-\frac{2}{5}b$
$20+910+51$
$x=2y$
$\frac{d^2y}{dx^2}=x\sin\left(x\right)$
$\left(2x^5+x^4+3x\right)+\left(5x^5+4x^3-x\right)$
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