exam Maths Puzzle Numerical Ability

(1/x+h+3)- (1/x+3)
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h

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exam Other Question

0.3(z-10) - 0.5z =-6 I need the process more than anything - nothing seems clear. 1st get rid of parenths, then distrubute? solve the following quadratic equation by factoring

15x^3-4x^2-4x=0