exam Maths Puzzle Numerical Ability

Solve the equation:
x/4 -1= x/5
I dont understand at all how to do it.

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exam Other Question

solve

(x^-2y^2/xz)/(xy/y^-2z^3)

thanks I was wondering if i could have an online tutor because i need help and i need someone to explain the equations to me one-on-one??? So if you could help that would be great!

thanks,
Isabel Jenkings