$\ln\left(15\right)-\ln\left(5\right)-\ln\left(3\right)$
$5xy=1$
$xy^2z^4;\:x=3;\:y=-2.z=1$
$\left(3x^2y^3-5x^6y^7\right)^5$
$a+b-c-b-c+2-a$
$\left(x+2\right)\left(x+3\right)^2+\left(x-4\right)^2+18x-29$
$-111+-385$
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