$\frac{196x^4y^3}{169m^2}-\frac{256a^8}{289b^4m^8}$
$\left(-1\right)^n\left(\frac{2^n}{3^n+n}\right)x^n$
$-x=30$
$\arctan\left(0.6514\right)$
$\left(2a-b\right)+\left(5a+b\right)$
$4x+12\left(x-3\right)=28$
$4m\cdot\left(m-8\right)$
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