$2.2\left(4.7+1.5y\right)-3.4\left(5x-2.7y\right)-\left(6.2x-7y\right)$
$12-\left(5+3\right)$
$5\sin^2\left(x\right)-9\sin\left(x\right)+1=0$
$7x>-14$
$\left(\frac{7}{5}-y^{2m-1}\right)\left(\frac{7}{5}+y^{2m-1}\right)$
$\frac{x}{2}-14=20$
$1.3-\left(-2.5\right)$
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