$30-\:-10-2+1$
$\frac{1}{4}a\:-\:5a\:+\:12a$
$z^2-5z=-6$
$4x\:+\:4=5x+3$
$\frac{\left(\left(3^2\right)^3-3^{-4}\right)}{\left(9-2\right)}$
$3+7+2g-6g$
$\frac{-2cosx}{sinx}=-2cotx$
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