$a^2+6a-5$
$\int\frac{e^x-e^{-x}}{e^x-e^{-x}}\:dx$
$3,56\cdot0,73$
$10x-6x+x$
$\left(7x\:+\:14\right)\:+\:9$
$4.56\cdot1.4$
$\frac{3}{4}\:=\:\frac{1}{4}\:x$
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