$20-x<35-2x$
$x^3-x^2+4x^3-x^2+x^2y+2-3x^2y\:$
$x^{-0.5}$
$21m^2n-3m^2y^2+42x^3y^4$
$\int_1^1xdx$
$45\cdot45\cdot45$
$5a-3b+2a+7b-4a-4b$
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