exam Maths Puzzle Numerical Ability

I need help simplifying and solving the following equation for H:

A= 1/2h(a+b).

I got to 2A=ha + hb. Is this right? How do I solve for H from here?

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exam Other Question

please help me to find the correct answer for the following:
problem #1: 4-2(k-3m) = 2e
find k

problem #2: 2x^3 y^4 z^3(4x^2 y^4 z^3 - 3xy^3 - 12yz f(x)=3x-2 and g(x)=1/(2x+3)

solve for (f*g)(-2)