$2a-3b-a+2b$
$x^2=45$
$\frac{dy}{dx}=\frac{y}{1-x^2}$
$\left(5x+4y\right)\left(3x+2y\right)$
$79\cdot30\cdot18cm$
$-x+5x-3x$
$f\left(x\right)=4\sqrt{5x^4}+6x^3+x^2$
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