Question 962375
Solve for a: {{{t/a + t/b = 1}}}
multiply by ab
ab*{{{t/a}}} + ab*{{{t/b}}} = ab
Cancel the denominators
bt + at = ab
at - ab = -bt
factor out a
a(t-b) = -bt
divide by (t-b)
a = {{{(-bt)/((t-b))}}}