$21ax\:+\:35ay\:+\:12x\:+\:20y$
$\frac{5x-17}{-4}=-7$
$3x^2+15x-3=0$
$-\int\frac{xe^{-\frac{3}{5}x}.\:\frac{1}{5}e^{-\frac{1}{5}x}}{-1\:xe^{-\frac{2}{5}x}}dx$
$8x-4y=16$
$\left(-9\left(4\left(-10\right)\right)\right)$
$g\left(n\right)=-2n^2+2$
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