exam Maths Puzzle Numerical Ability

13-2/5 = H + 6-4/15
My daughter has just begun to take Pre-Alegbra & we are seeking help in learning the proper to understand equations. Thanks!

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exam Other Question

Find an equation for the line with y-intercept 3 that is perpendicular to the line y=(2/3)x-4. Thank you! Find the inverce of the function f(x)= 2/3x- 3/5.

I know the answer is f^-1 (x) =3/2x + 9/10.

It is really important to me to know how it is done. I need to know the solution. Thanks