exam Maths Puzzle Numerical Ability

If a^2+b^2 = 7ab, show that log a+b/3=1/2 (loga + logb)

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3x-0.54=2(x-0.15) Help please, I just can not figure out what do do here. This is number 2 I need help with and grealy apprieciate all help. It says to graph the inequality on a plane. Thank you. Gr