$7-9x=34$
$\left(7^2-16\right)$
$\left(a-\frac{2}{3}\right)\left(a\:mas\frac{1}{4}\right)$
$\frac{\left(50\cdot\left(-i\cdot1000\right)\right)}{\left(50-i\cdot\:1000\right)}$
$\log\left(x+2\right)-\log3=\log4$
$4x^2+2=0$
$3xy^2+5y-y^3$
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