exam Maths Puzzle Numerical Ability

-(3-10)-(6-3)
My answer is not coming out correctly.
Please see my version-

-(3+(-10))-3=
-(-7)-3=
-(-7)+(-3)= -13

The textbook gives the answer as 4. Where am I going wrong?

Thank you.

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exam Other Question

add express in simplest form

x^2
over
x+10

plus
9x-10
over
x+10
Solve each equation. If a solution is extraneous, so indicate.
(5)/(2z+z-3)-(2)/(2z+3)=(z+1)/(z-1)-(1)