exam Maths Puzzle Numerical Ability

Write a proportion that is equivalent to the statement: If 3 gallons of gasoline cost $5.37, then 8 gallons will cost $14.32.

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Please help me solve.

2x^2-4x+16=0 The problem I have is what to do with an absolute value cubed and in brackets. Example:

-6(24-9 X /2-10/^3) the 2-10^3 should be in the absolute bracket lines but my computer