If two times a number is equal to that number minus 4, what is the number?

IF twice a number is equal to that number minus five , what is three times that number plus seventeen minus that number?

If 7 times a number is 84, what 4 times the number?

If 40% of a number is equal to two-third of another number, what is the ratio of first number to the second number?

Five times a number is equal to three times the sum of the number and 4 . What is the number?

The difference of the squares of two numbers is 45. The square of the smaller number is 4 times the larger number. Determine the numbers.