If it's not what You are looking for type in the equation solver your own equation and let us solve it.
x in (-oo:+oo)
x/a+x/b = c // - c
x/a+x/b-c = 0
b^-1*x-c = 0 // + c
b^-1*x = c // : b^-1
x = c/(b^-1)
x = c/(b^-1)
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