exam Maths Puzzle Numerical Ability

How do you solve the equation for x:

7.7x10^3 = [0+2x]/[3.5-x][3.5-x]

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exam Other Question

Find the product of the cube of (-4/3) and square of (-3/2).

Would i go about this like this:

(-4/3)*(-4/3)*(-4/3)*(-4/3)

(-3/2)*(-3/2)

Is this correct? christie wants to dilute a 10% soap solution with water to make 10 gallons of a 3% soap solution. How much water and how much 10% solution should she mix together?