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Question

3(x+1)(y+2)(z+3)=7 the find xyz

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Solution

3(x+1)(y+2)(z+3)=7

Cubing both sides, we get

(x+1)(y+2)(z+3)=73=343

[x(y+2)+1(y+2)](z+3)=343

[xy+2x+y+2](z+3)=343

xy(z+3)+2x(z+3)+y(z+3)+2(z+3)=343

xyz+3xy+2xz+6x+yz+3y+2z+6=343

xyz=343(3xy+2xz+6x+yz+3y+2z+6)

xyz=3433xy2xz6xyz3y2z6

xyz=6x3y2z3xy2xzyz+337


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