$4c+5c$
$\int x\left(x^2+2x+3\right)dx$
$-2020-2008$
$\left(\:5x-2\right)\left(5x\:-2\right)$
$5+x<-x+3$
$\left(-25\right)-\left(-32\right)-\left(+15\right)$
$9sen^2a-12sena=1$
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