$3k-2x+6x+5$
$0.02-0.2$
$\frac{sin\left(2x\right)}{sin\left(x\right)}=2$
$5a^2-ab-5ab-5b^2$
$\left(234\right)-\left(-129\right)+\left(+78\right)-\left(+82\right)-\left(124\right)$
$12a^2y^2+10ax+3a^2y^2-5ax$
$\frac{x^3+x^2-12}{x-2}$
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