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x in (-oo:+oo)
x = (4/5)*(x+10) // - (4/5)*(x+10)
x-((4/5)*(x+10)) = 0
(-4/5)*(x+10)+x = 0
x-4/5*(x+10) = 0
x-4/5*(x+10) = 0
1/5*x-8 = 0
1/5*x-8 = 0
1/5*x-8 = 0 // + 8
1/5*x = 8 // : 1/5
x = 8/1/5
x = 40
x = 40
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