$\left(\left(x-3y\right)\left(x+3y\right)\right)^2$
$-\frac{x}{4}=12$
$\left(2x\right)dx+\left(y^2+1\right)dy=0$
$\int_0^t\left(e^{-5t}sen\left(7t\right)\right)dt$
$\frac{3}{2}xz+z+\frac{1}{2}z$
$ax+\frac{1}{5}ax+\frac{3}{10}ax$
$7x+7y$
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