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It is: 18u -5u = 13u simplified
Wiki User
6t -2t + 5u = 4t - 5u
3u - 5u= - 2u=====
c = 18u + 85 c - 85 = 18u (c - 85)/18 = u
(9 - 5u)(9 + 5u)
5u + 2 = -185u = -20u = -4