$y=2x^2-6x;\:x=-6$
$\int\left(\frac{4x^2}{\:x^3+x^2-x-1}\right)dx$
$4^2.4^5$
$5x^2;\:x=7$
$x^2+21x+108$
$2x+y;\:x=7;\:y=10by$
$c^2-12+36$
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