$\frac{7}{x-1}\ge\frac{1}{2}$
$-15z\:=-225$
$25d^8-80d^4+64$
$\frac{5x^4+9}{x}$
$f\left(x\right)=\frac{3x+13}{\left(x-4\right)\cdot\left(x+1\right)}dx$
$\frac{\sin\left(2a\right)}{1-\cos\left(a\right)^2}$
$3\cos\left(x\right)+9=7$
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