exam Maths Puzzle Numerical Ability

if there are 6*10^9 people on the earth and there is enough freshwater to provide each person with 8.79*10^5 L, how much freahwater is on the earth?

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8x to the 3rd power - 6x squared + 2x OVER 4x + 1 the answer i got for the following is 20/27. I dont think is right though. The problem is -2(5x+3)=7(3-5x)is > or = to 4(4-3x)-3(7+2x).