exam Maths Puzzle Numerical Ability

Find the sum of 3-2x-5xsquared and 7xsquared-4 in simplest form.

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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). find the domain of f(x)=7+ sqrt 3x+21