book Maths Puzzle Numerical Ability

Solve for the equation 5/2t= -3/5 I get 2=t is this true?

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book Other Question

What are the steps to solve for the domain of F contains all reall number x except x=_________ from the problem f(x)= (7x+7)/(5x+8)? how do you factor a binomial that has no common factors and are not perfect squares?
For example- how would you factor
4m^2+7m or
7m^2-4m