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x in (-oo:+oo)
2*(x/5-1) = 8 // - 8
2*(x/5-1)-8 = 0
2*(1/5*x-1)-8 = 0
2*(1/5*x-1)-8 = 0
2/5*x-10 = 0
2/5*x-10 = 0
2/5*x-10 = 0 // + 10
2/5*x = 10 // : 2/5
x = 10/2/5
x = 25
x = 25
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