$84p+59q+12p+9r+21p$
$0,25\:x\:1,6$
$53+15\times20$
$5 - ( ( 8 - 6.3 ) + 1 ( 5 \cdot - 3 + 5 ) - 7 )$
$5\left(x+4\right)=5\left(x-6\right)$
$\lim_{x\to0}\left(\frac{x^2+2x-1}{x^2-1}\right)$
$5+-8z+-4$
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