$4x^2-9y^2=36$
$-6x^2+13x-2$
$\left(-7x^3y\right)\left(5x^2y^3\right)$
$\frac{2}{7}y-\frac{3}{7}y$
$-4-5-1-7-8$
$10^4\cdot4^{10}$
$\frac{6y^7}{y^7}$
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