$15-1600$
$\left(x-15.6\right)^2$
$4r+6r.$
$\left(nt\right)\left(3nt^3+t^2+24nt+91\right)$
$\tan\left(x\right)-3=0$
$4+3b+10+9b$
$b^6-22b^3+121$
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