$\frac{28}{x+11}=\frac{2x-7}{21}$
$y^2+y^2\sin\left(x\right)=0$
$2x\left(2x-1\right)\left(x-1\right)$
$\frac{dy}{dx}=\frac{\sec^2\left(x\right)}{1+2y}$
$-x^2+5x+150;x=3$
$-\int_b^a\left(x\right)dx$
$2\left(x+u\right)$
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