$\frac{x-3}{x+5}=\:\frac{x-5}{x\:+3}$
$20-\left|-30\right|$
$25n^2-36m^2$
$120\cdot24$
$\frac{\sin\left(x\right).\tan\left(x\right)}{\sec\left(x\right)\left(\cos^2\left(x-1\right)\right)}$
$-5.55-8.55+4.35$
$\frac{x^4-2x^2+1}{x^3+2}$
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