$-4xy^3+-7xy^3$
$tn^{\circ}8=\left(2x-1\right)^{15}$
$\left(1-2x\right)\frac{1}{2}$
$3\left(2\right)+\frac{2}{2}$
$\:\sin\:\left(30^{\circ\:}\:+\:x\right)\:-\cos\:\left(60^{\circ\:}\:+\:x\right)=\:-\frac{\sqrt{3}}{2}$
$8mn-7m^2n+11-8m^2n+6mn-13+11m^2n$
$\frac{5}{4}x^3-\frac{3}{5}x^3+5x^3$
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