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x in (-oo:+oo)
(1/3)*x = -2.5 // + 2.5
(1/3)*x+2.5 = 0
1/3*x+2.5 = 0 // - 2.5
1/3*x = -2.5 // : 1/3
x = -2.5/1/3
x = -7.50000008
x = -7.50000008
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