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x in (-oo:+oo)
(8/15)*x = -4/12 // + -4/12
(8/15)*x-(-4/12) = 0
(8/15)*x+1/3 = 0
8/15*x+1/3 = 0 // - 1/3
8/15*x = -1/3 // : 8/15
x = -1/3/8/15
x = -5/8
x = -5/8
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