$7x^2+14=861$
$a\left(x\right)=5+3x^1+2x-x^4+4x^2$
$\left(y+10\right)\left(y-7\right)$
$-3x^2+2x-9$
$h\left(d\right)=-0.003d^2+0.6d$
$23x+2y^2-z;\:x=2;\:y=10;\:z=1$
$x\frac{dy}{dx}-y=3x^8,\:y\left(1\right)=10$
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