$\left(a\:-\:12\right)\:\cdot\:\left(a\:-\:7\right)$
$6x-3\left(-5x+3\right)=-114$
$0=4\cos^2\left(x\right)+2\cos\left(x\right)-1$
$\frac{26y^{17}x^{19}}{13x^5y^5}$
$\left(2m^2n-3n^3\right)^2$
$36m^4-24m^2+4$
$3x^2-15$
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