book Maths Puzzle Numerical Ability

Is there any specific formula other than strategies such as guess-and-check to solve equations like this -- 3(4y-1)-(y+2)=7.35?

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I have one more (18x^5y^2/6x^2y^-4)^-1. I am hoping with the explantion I will be able to understand more. Thank you for your help.. how do you solve this problem : 2e and then in the exponent log base 3 (x +2) = 14?