book Maths Puzzle Numerical Ability

I am trying this problem solve -5/4x+1/4x=2x+1/2=3/4x and I am very confused.

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How many gallons of a 15% acid solution must be mixed with 2 gallons of a 23% acid solution to make a 18% acid solution? Find the x-intercepts for y=x^3(x+2)(3x-1)