12x 9y^2 - 5xy^4 15x^3 y^2
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Is it? $\displaystyle \frac{12x\cdot9y^2} { - 5xy^4\cdot15x^3\cdot y^2}$ or $\displaystyle 12x\cdot9y^2 -(5xy^4\cdot15x^3\cdot y^2)$ ?
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