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x in (-oo:+oo)
(6/3)*x = -6/15 // + -6/15
(6/3)*x-(-6/15) = 0
(6/3)*x+2/5 = 0
2*x+2/5 = 0 // - 2/5
2*x = -2/5 // : 2
x = -2/5/2
x = -1/5
x = -1/5
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