$-18+3\left(-10+3\cdot7\right)$
$5x^2-50x+30=0$
$64x^2-12x+1$
$6.7+2.89-0.4^2$
$\left(\frac{a^5b^7}{c^{-2}}\right)^3$
$m^2+71mn-14m^2-65mn+m-m^2$
$f-2=5$
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