$x\cdot x\:+4x-5$
$5\left(cos\left(x\right)-3\right)\left(tan\left(x\right)-8\right)=0$
$a+\left(+b-c\right)+2a-\left(+a+b\right)$
$\int\frac{x+1000}{\left(x+500\right)\left(x+700\right)}dx$
$-187+-16-60$
$4x^2-12x-11=0$
$100-x^2y^2$
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