exam Maths Puzzle Numerical Ability

I am having a hard time trying to solve this equation 9t-8t=7 Please help?

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A survey of sophomores showed that 5/6 of the males were taking a math class and 3/4 of the females wer taking a math clas. 1/3 of the males were enrolled in calculus and 1/5 of th multiply. (3x-1)(2x+5)