the product of a and b is equal to 1 more than twice the sum of a and b . if b = 7 , what is the value of b - a ?
"ab = 1 + 2 ( a + b ) 7 a = 1 + 2 a + 14 5 a = 15 a = 3 b - a = 7 - 3 = 4 c is the answer"
subtract(7, divide(add(multiply(7, const_2), 1), subtract(7, const_2)))