book Maths Puzzle Numerical Ability

solve the equation: log a (3x + 5) - log a (x - 5) = log a 8

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book Other Question

HOW CAN I FIND THE EQUATION OF THE LINE PASSING THROUGH THE GIVEN POINTS?
AFTER YOU FIND THE EQUATION OF THE LINE PASSING THROUGH THE GIVEN POINTS HOW DO YOU FIND THE Y-INTERCEPT? suppose you have a bag that contains seven yellow, eight blue, and ten red marbles. You draw two marbles without replacement. What is the probability that both marbles are red?