exam Maths Puzzle Numerical Ability

solve x/6+3=0

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exam Other Question

i need help to factorize x^6 - 7x^3 -8 i know the answer its (x-2)(x+2x+4) (x^2-x +1) but i didnt understand how to solve the sum,please help and thanks You travel 60 kilometers in 1.5 hours. What is your average speed?