$3a+2b-4c;\:a=5;\:b=8;c=-2$
$18bc-6ac+12bc^2+6c$
$2\ln\left(x\right)-\ln\left(2x-9\right)=\ln\left(5x\right)-\ln\left(x-4\right)$
$2t\left(5t+1\right)^2$
$\int\frac{3x^2-2}{x^4-16}dx$
$\int\frac{x+3}{x^{2}-16}dx$
$18\:-\:\left(-43\right)$
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