$a+3-a+4$
$-4\left(x+6\right)+2\left(x-2\right)$
$0.125\:.\:\left(-2\right)\:\left(-4\right)^3\left(4\right)^2\:+\:\frac{1}{16}\:\left(3\right)^3\:\left(-4\right)^2\:\left(4\right)$
$( 7 ^ { 2 } ) ^ { - 3 } \cdot 7 ^ { 3 }$
$9^2+9$
$\int\left(x^2+5x+6\right)\cos\left(2\right)dx$
$\frac{3x+1}{x-4}\le1$
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