$\frac{x+1}{3}-\frac{x-1}{5}=\frac{2}{15}$
$\int\frac{1}{5}x^7\ln\left(9x\right)dx$
$b\int\left(x^{2}+1\right)e^{x}dx$
$4a+3a+2a-9a$
$x-6\le3x+12$
$6.\left\{3.\left\{9+4\left(5.3-9\right)\right\}-3.\left(40-8\right)\right\}$
$1+\:\frac{-x-6}{12}=\:3-\:\frac{4-5x}{28}$
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