$4x^2-10x-25$
$\frac{10a^7b^9}{15a^5b}$
$\left(2x+3\right).\left(2x-3\right)+3\:\left(x+6\right)$
$7y+4y-3y$
$\frac{25a^2-121}{5-11}$
$\frac{y^2+3y}{x^2+1}$
$ax^2+bx^2+ay^2+by^2$
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