exam Maths Puzzle Numerical Ability

I need help solving this logarithmic equation

log 5(7+x)+log5 (8-x)-logx5 2=2

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exam Other Question

The square of a number is the second power of the number. The cube of a number is the third power of the number. Explain why these names are reasonable. Solve the system by graphing
x - y = 2
3x - 3y = 6