$0.5x^2y+0.4xy^2+0.3x^2y-0.2xy^2+x^2y$
$5x+3y-2x+y$
$a^2-a^2b^2+\frac{b^4}{4}$
$3x^2+4x^2-5x^2$
$32x^2+18x=-17$
$\left(3x^{4a-5}\right)^2$
$\left(x^2+1\right)\left(x+1\right)^2$
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