$-5a-2b-3c$
$2\left(5+8\right)-3\left(\:6\cdot3+2\right)\:$
$\left(9x+x\right)\left(x-9x\right)$
$25x^4y^4-1$
$\frac{7}{\frac{5}{5}}$
$0.04+\left(0.04\right)^2$
$18a^2\:-61ab-8a^2+210-51ab-31+a^3-3ab$
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