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1)2x^2 y^3 z +3x^2 y^3 z
5x^2 y^3 z
2) 2x^3-5x^3
-3x^3
3) 3x^4-2x^4+7x^4
8x^4
2) 2a^2 b c^3 - 5a^2 b c^3 + 3a^z b c^3- 2a^z b c^3
-3a^2 b c^3 + a^z b c ^3