$4x-7<3x+8$
$5^{12}:2^3$
$4t+3=4t^2$
$2x-y=-4$
$\left(x^4+x^2y^2\:+y^4\right)\left(y^4-x^2y^2+x^4\right)$
$x^2-x-42$
$6xy^3-9nx^2y^3-3n^2x^4y^3$
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