$30a^5b-60a^3b+30ab$
$7i-3i$
$6x^2-5x-21$
$4x^2-47x-135$
$x^2+12x+10$
$25\sec^2\left(5x\right)-5\tan\left(5x\right)^2=25$
$-6.2+-3.6$
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