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x in (-oo:+oo)
(16/5)*x = -4/15 // + -4/15
(16/5)*x-(-4/15) = 0
(16/5)*x+4/15 = 0
16/5*x+4/15 = 0 // - 4/15
16/5*x = -4/15 // : 16/5
x = -4/15/16/5
x = -1/12
x = -1/12
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