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