$x^2+xy+xz-x$
$80\cdot31$
$\:-2a\:=-\:48\:$
$\lim_{h\to0}\left(\frac{\frac{2}{x+h}-\frac{2}{x}}{h}\right)$
$\int_1^{-\infty}\left(\frac{1}{x^2}\right)dx$
$1.89\cdot12.61$
$0.5x^2+5x+6.25$
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