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x in (-oo:+oo)
(3/14)*x = -5/2 // + -5/2
(3/14)*x-(-5/2) = 0
(3/14)*x+5/2 = 0
3/14*x+5/2 = 0 // - 5/2
3/14*x = -5/2 // : 3/14
x = -5/2/3/14
x = -35/3
x = -35/3
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