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