$1\frac{3}{4}a-b+\frac{7}{3}c+5\frac{1}{2}a+b-c-7\frac{1}{2}a+\frac{7}{2}b-\frac{7}{2}b$
$\left(2-3i\right)+\left(2+7i\right)$
$-9+\left(8-2\cdot3\right)\cdot3-\left(-7\right)+12:\left(-2^2\right)$
$4b^2+4b+9$
$10\ln\left(x^2+4\right)+8\ln\left(2x-5\right)$
$\frac{-2\left(3\right)^2-\left(3\right)+5}{3-3}$
$\sqrt{72x}$
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