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$9x^3-6x^2+12x^5-18x^7$
$\frac{5x-15}{x}$
$\ln10=\ln\left(x-6\right)+\ln\left(2\right)$
$4b+5c+3b+5c$
$16t^2-72t+81$
$-12x\:+\:13=-59$
$\left(a+3b\right)^4-22\left(a+3b\right)+121$
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