book Maths Puzzle Numerical Ability

I am having trouble solving the following problem. Please help.

seven thirds x = two thirds. It is a fraction equation.

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book Other Question

the denominator of a fraction is 1 more then the numerator. If the numerator is decreased by 1, the value of the resulting fraction is 3/4. What is the original fraction? The line that has a slope 1/2 and contains (5,6)