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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book Other Question

a six-sided number cube is rolled 210 times. four comes up 33 times. To the nearest hundred, what is the experimental probability of rolling a four? 5x-8=-8+3x-1x