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x in (-oo:+oo)
3*x-(1/5) = -8 // + 8
3*x-(1/5)+8 = 0
3*x-1/5+8 = 0
3*x+39/5 = 0 // - 39/5
3*x = -39/5 // : 3
x = -39/5/3
x = -13/5
x = -13/5
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