$5r^4+10r^2+5$
$1+0.015$
$3\left(2\right)^{x-2}=48$
$-a+b-c+8+2a+2b-19-2c-19-2c-3a-3-3b+3c$
$\int2\sqrt{x+4}dx$
$5=n-9$
$\int\frac{x}{\sqrt{7+6x-x^2}}dx$
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