book Maths Puzzle Numerical Ability

how do you solve this problem?
5-3(x+1)=5

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book Other Question

Two marbles are drawn without replacement from a box with 3 white, 2 green, 2 red, and 1 blue marble. What is the probability that both marbles are white? Please answer in fraction form. R = (0.75V/pie)^3
Where V is it�s volume, find the radius of a spherical tank that has a volume of 32 pie/3 cubic meters