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x in (-oo:+oo)
x = (4/5)*x+20 // - (4/5)*x+20
x-((4/5)*x)-20 = 0
x+(-4/5)*x-20 = 0
1/5*x-20 = 0 // + 20
1/5*x = 20 // : 1/5
x = 20/1/5
x = 100
x = 100
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