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x in (-oo:+oo)
x-((3/5)*x) = 8 // - 8
x-((3/5)*x)-8 = 0
x+(-3/5)*x-8 = 0
2/5*x-8 = 0 // + 8
2/5*x = 8 // : 2/5
x = 8/2/5
x = 20
x = 20
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