$-12x+9y=7$
$\left\{\left[\left(-2\right)2\right]3\right\}4$
$15\cot x+17\cos x$
$\frac{dy}{dx}=\frac{x^5}{y^4}$
$\frac{dy}{dx}=\frac{3y+x^2}{x}$
$\int\left(-sen\left(-2x\right)\right)dx$
$x^2+5x-225=0$
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