(3m²n³)/(mn)²(15x³-10x²)/5x=

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(3m²n³)/(mn)²(15x³-10x²)/5x=
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(3m²n³)/(mn)²(15x³-10x²)/5x=
(3m²n³)/(mn)²
(15x³-10x²)/5x=

(3m²n³)/(mn)²(15x³-10x²)/5x=
(3m²n³)/(mn)²=(3m²n³)/(m²n²)=3n