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(1/5)*x-1 = (4/5)*x-13 // - (4/5)*x-13
(1/5)*x-((4/5)*x)-1+13 = 0
(1/5)*x+(-4/5)*x-1+13 = 0
12-3/5*x = 0 // - 12
-3/5*x = -12 // : -3/5
x = -12/(-3/5)
x = 20
x = 20
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