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(4/5)*x+1 = x+1/5 // - x+1/5
(4/5)*x-x-(1/5)+1 = 0
(4/5)*x-x-1/5+1 = 0
4/5-1/5*x = 0 // - 4/5
-1/5*x = -4/5 // : -1/5
x = -4/5/(-1/5)
x = 4
x = 4
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