$\frac{\left(2a+9b\right)}{3}$
$\int-3\ln\left(x^2-1\right)dx$
$\left(-8\right).\left(-2\right).\left(-30\right).13$
$2a^2+7a^2-5a^2$
$12x-4\:3x+1$
$2a^2+3b^2-5a^2-12b^2$
$-\left(-5+8\right)\cdot2$
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