...?so like can you help

Find the value of the variable and the length of each secant segment.

Twice the sum of a number and 4 is equal to three times the difference of the number and 7. find the number.

Marco has $38.43 dollars in his checking account. his checking account is linked to his amazon music account so he can buy music. the songs he purchases cost $1.29. part 1: write an expression to describe the amount of money in his checking account in relationship to the number of songs he purchases. part 2: describe what the variable represents in this situation.