$12a+8a+4a-15a-9a$
$12-\frac{1}{3}u=2$
$\left(23i-2\right)-\left(4i-11\right)$
$x^2\le8x-12$
$\left(105\right)\left(-7\right)$
$z=\frac{y}{x}$
$\frac{1}{2}x\ge3x+8$
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