$a-a+2a^2-3a^2-1-4-4$
$\left(10b+4\right)+\left(6-9b\right)-\left(3b-7\right)$
$x^2\left(a-1\right)-y^2\left(a-1\right)$
$\:-78\:x\:22\:$
$-\frac{0.186}{9.3}$
$\left(x-3\right)^{\frac{3}{2}}=8$
$\left(15n-\frac{1}{3m}\right)\left(15n+\frac{1}{3m}\right)$
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