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4 = 1/1-(0.8*(1-x)) // - 1/1-(0.8*(1-x))
0.8*(1-x)-(1/1)+4 = 0
0.8*(1-x)-1+4 = 0
0.8*(1-x)-1+4 = 0
4-0.8*x-0.2 = 0
3.8-0.8*x = 0
3.8-0.8*x = 0
3.8-0.8*x = 0 // - 3.8
-0.8*x = -3.8 // : -0.8
x = -3.8/(-0.8)
x = 4.75
x = 4.75
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