$\ln\left(x+4\right)-\ln\left(x\right)=3$
$\frac{1}{4}r+2=10$
$\frac{\left(+525\right)}{\left(-5\right)}$
$\left(-\frac{3}{8}a^xb^{m+1}\right)\left(-\frac{4}{5}a^{x-1}b^n\right)$
$-3.84i-9i$
$\frac{3x-5}{4}\ge3$
$76-43-54+87+91$
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