Please combine like terms for the following problem:

7x + 5 - 15x - 23 + 5y

Two times a number plus three times another number equals 4. three times the first number plus four times the other number is 7. find the numbers

Jonathan can type 20 documents in 40 minutes ,and susan can type it in 30 minutes and jack can type it in 24 minutes working together ,how much time will it is take them type the same document

Rationalize the denominator- 12x/√x-10