$4x^2+x-3$
$9^5\cdot9^7$
$3x^2+9x-12$
$\:28nb\:+\:7nb\:+\:12nb\:+\:nb$
$7a^2b+14a^3b-21a^5b$
$7\left(1+8-7+3\right)$
$2b^2-8b^2+4b$
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