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x in (-oo:+oo)
(2/15)*x = -5/2 // + -5/2
(2/15)*x-(-5/2) = 0
(2/15)*x+5/2 = 0
2/15*x+5/2 = 0 // - 5/2
2/15*x = -5/2 // : 2/15
x = -5/2/2/15
x = -75/4
x = -75/4
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