$-\left(3+4+\right)\left(4+7\right)+4-9$
$12a-8-12$
$\left(a-b+c\right)\left(a+b-c\right)$
$\left(3m^{6}np^{4}\right)^{5}$
$cot\left(x\right)+2=2$
$2x^3-18x^3+53x^2+54x$
$x-5.5=10.5$
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