$15+\left(-5\right)-\frac{2}{5}j-\frac{4}{5}j+7$
$( a ^ { 3 } + 7 ) ( a ^ { 3 } - 6 )$
$\frac{1}{\ln\left(0\right)}$
$y^2+4y=0$
$3+70y+25y^2$
$c\left(q\right)\:=\:0.001q^2\:-0.05q^2+40q+\:4000$
$2x^2-\frac{4}{9}y^2$
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