$+15x^2y^4-x^2y^2$
$2x^2-4x+1;\:x=3$
$3x-4x+x-6+5$
$\frac{4\left(2z\:-\:3x\right)-5\left(x\:+\:4z\right)-\:x\:-6\left(3y\right)}{3}$
$\frac{5x^2-10x}{x^2+3x-10}$
$x^2-3x-54=0$
$\left(-6m^6-3n^3\right)^2$
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