exam Maths Puzzle Numerical Ability

What is the evaluation of this expression

13 - -4

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exam Other Question

How is this equation solved 7/8x + 1/4 =3/4x find the value for m and b in the following system so that the solution to the sysytem is (-3, 4)
5x+7y =b

and

mx+y = 22

thank you for the help