$\frac{1}{25}a^6+4a^2$
$70-\left(-40+31\right)-\left(-55\right)$
$y-y\cdot\sec\left(x\right)=0$
$2x^2-5x-7$
$26-78-8+56+11-36-26+8$
$\frac { 16 m ^ { 2 } n ^ { 4 } } { - 5 n ^ { 3 } }$
$a^2+14a+33=0$
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