$7^{x+4}=49^{2x-1}$
$\lim_{x\to3}\frac{7x+28}{x^2+x-12}$
$\frac{x^4+2x^3-10}{x-2}$
$7a^2b^3+4a^2b^3-5a^2b^3$
$20x^4y^3-10x^3y^4+15x^2y^5$
$\csc\left(x\right)\left(\sin\left(x\right)+\sin\left(x\right)\tan^2\left(x\right)\right)$
$4x^5-8x^4+4x^3$
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