Find 5x, If (a + b + c) ≠ 0 and \(\frac{a}{(3a\space +\space b\space + \space c)}\) = \(\frac{b}{(a\space +\space 3b\space + \space c)}\) = \(\frac{c}{(a\space +\space b\space + \space 3c)}\) = 3x