text: can anyone help me solve this? in the equation 1/x=1/a+1/b..... how can i transform it so i can solve it in terms of a ...i can only use the variables..... 1/x = 1/a + 1/b  1/x - 1/b = 1/a  b/bx - x/bx = 1/a  (b-x)/bx = 1/a  a(b-x)/bx = 1  a = bx/(b-x)