exam Maths Puzzle Numerical Ability

The product of 3 and the sum of a number and 5 is the same as the product of -2 and the difference of the same number from 3. Find the number.

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exam Other Question

Write the equation of the line slope-intercept form if the slop is 2/3 and (9,3) is a point on the line. Solve the equation: log x + log (x + 48) = 2
I know the answer is 2 from the answers in the back of the book.
I need to know how the solution was solved.