exam Maths Puzzle Numerical Ability

the question is to solve the problem

3/4y-4/6=5/12y
my answer was -4y
what did i do wrong

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exam Other Question

You toss 3 coins. What is the probability that you get exactly 2 heads, given that you get at least one head? Hello, can someone help me factor this problem?

1.m^3-27

I need help trying to solve these problems

1.x^3-x^2-20x=0

2.5x^2+3x=2

3.x(x-x5)=36

Thanks