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9-((4/5)*(x-3)) = 1 // - 1
9-((4/5)*(x-3))-1 = 0
(-4/5)*(x-3)-1+9 = 0
9-4/5*(x-3)-1 = 0
9-4/5*(x-3)-1 = 0
7/5-4/5*x+9 = 0
52/5-4/5*x = 0
52/5-4/5*x = 0
52/5-4/5*x = 0 // - 52/5
-4/5*x = -52/5 // : -4/5
x = -52/5/(-4/5)
x = 13
x = 13
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