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x in (-oo:+oo)
(5/8)*x = -2/4 // + -2/4
(5/8)*x-(-2/4) = 0
(5/8)*x+1/2 = 0
5/8*x+1/2 = 0 // - 1/2
5/8*x = -1/2 // : 5/8
x = -1/2/5/8
x = -4/5
x = -4/5
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