$2x^2+4x^2+2y^2-y^2$
$+3+4+2+6$
$3\left(-7+1\right)$
$-4ab+5a-6ab-10a+ab$
$a^4-2a^2+1$
$\frac{-3\left(20\right)}{12}$
$-2x+4+x+5-5y+3x$
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