$13-\left(4+8\right)-3\cdot54$
$36+-1+4$
$\lim_{x\to3}\left(3x+6\right)\left(2x+1\right)$
$-53+75a-22a=0$
$2n-6n$
$\int2\left(x+5\right)^3dx$
$x^2+6x-1$
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