book Maths Puzzle Numerical Ability

please help me with this...

-0.5x + 4 + 2x = 9

will you show me how you did it?

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book Other Question

If the Richter magnitude formula is R=0.671 Log(0.37E)+1.46. R= Magnitude and E= the energy in kilowatt-hours. What is the magnitude of 5.02x10^8 kwh of energy? Graph the function.
f (x) = -2x - 5 ( , ) ( , )
State in words exactly where the points should be located.