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x in (-oo:+oo)
(1/3)*x = -6.6 // + 6.6
(1/3)*x+6.6 = 0
1/3*x+6.6 = 0 // - 6.6
1/3*x = -6.6 // : 1/3
x = -6.6/1/3
x = -19.8000002
x = -19.8000002
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