$x^2+x^2+4x+9$
$2x-15x+18$
$\left(m-13\left(m+13\right)\right)$
$sin\left(sin-\frac{3}{5}+cos-\frac{20}{29}\right)$
$102,31+3,339$
$60.00-50.05$
$x^2+x^2y-xy^2$
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