$0=x^4-9x^2$
$27-\left(16-25\right)$
$\left(2x^2-3\right)+\left(2x-1\right)$
$\left(x+y\right)\cdot4=4x+4y$
$tanx=5,6$
$21x-46x$
$\frac { 1 } { 3 x ^ { 2 } + x }$
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