a and b together can do a work in 7 days . if a alone can do it in 14 days . in how many days can b alone do it ?
"a 14 1 / 7 â € “ 1 / 14 = 1 / 14 = > 14"
add(inverse(subtract(divide(const_1, 7), divide(const_1, 14))), divide(const_2, add(const_2, const_3)))