$\left(\frac{1}{2}x+5\right)^2$
$56^0$
$\left(-2\right)\:x\:\left(+3\right)$
$2c^2+18c+36$
$-4x^2-9x^3-13x^2+3x^2;\:x=7;\:x=2$
$3\cdot\left(x-6\right)-8,\:para\:x=9$
$-4d\:+\:-3d\:+\:-13d\:+\:17d\:=\:15$
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