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x in (-oo:+oo)
(1/3)*x = -4/5 // + -4/5
(1/3)*x-(-4/5) = 0
(1/3)*x+4/5 = 0
1/3*x+4/5 = 0 // - 4/5
1/3*x = -4/5 // : 1/3
x = -4/5/1/3
x = -12/5
x = -12/5
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