Question 385912
IF X=5A^3-3B^3, Y=4A^2B-7AB^2+2B^3,  Z=4A^3-5A^2+3AB^2, FIND THE VALUE OF 
   X+2Y+3Z
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{{{(5a^3-3b^3)+2(4a^2b-7ab^2+2b^3)+3(4a^3-5a^2+3ab^2)}}}
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{{{(5a^3-3b^3+8a^2b-14ab^2+4b^3+12a^3-15a^2+9ab^2)}}}
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{{{5a^3+12a^3-3b^3+4b^3+8a^2b-14ab^2+9ab^2-15a^2}}}
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{{{17a^3+b^3+8a^2b-5ab^2-15a^2}}}
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