$12.4\cdot8.5$
$1+\sqrt{3}+1-\sqrt{3}$
$99-3-5$
$c^2+2c+1$
$\int _ { 1 } ^ { x ^ { 2 } } t d t$
$\log_x\left(4\right)=-2$
$3a\left(b+1\right)+\left(b+1\right)$
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