$\left(-43\right):\left(-43\right)$
$\left(5+3\right)+2^2$
$4x\ge1-x$
$x^2-5x-28$
$40x^{8}y^{6}:2x^{3}y^{4}$
$2^2-x-6$
$4x\:+\:4=5x+3$
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