$a+a+2a+3b+4a$
$\left(x^2-2\right)\left(x^2-10\right)$
$8x^2+7x-6$
$ax-2bx-9ay+18by$
$\:-8\:.\:12$
$y^2-3y+9$
$2y^3-2y^3+2y+4x-7x+4x-4y$
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