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x in (-oo:+oo)
x-((4/5)*x) = 60 // - 60
x-((4/5)*x)-60 = 0
x+(-4/5)*x-60 = 0
1/5*x-60 = 0 // + 60
1/5*x = 60 // : 1/5
x = 60/1/5
x = 300
x = 300
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