$2.49+6.21$
$7c+2x+2f^2+3x-3c$
$-3x^2+6x=0$
$\left(7x+2x^4\right)$
$14m^2-12m-10$
$4+4\left(4+4\cdot0\right)+\:4\cdot0$
$3\sqrt{5}+4\sqrt{5}-2\sqrt{5}$
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