book Maths Puzzle Numerical Ability

Please help me!!!! I need to solve this for H:
2A-ha=hb

A)h=a-b/2A
B)h=2A/a-b
C)h=a+b/2A
D)h=2A/a+b

Please show me step by step how to figure this out...thanks

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book Other Question
it tell you to use the substitution method to solve the linear system

x +2y = - 5
4x-3y=2


3x-2y=4
x+3y=5


3x+y= -2
x+3y=2 Write a polynomial function of least degree with integral coefficients whose zeros include 4 and 2i.