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Q16Section A (Section A)16 of 60

Value of a combination fixed by two equations

If x,yx,y and zz are real numbers such that 4x+2y+z=314x+2y+z=31 and 2x+4y−z=192x+4y-z=19, then the value of 9x+7y+z9x+7y+z

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