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x in (-oo:+oo)
12 = (-6/5)*x // - (-6/5)*x
12-((-6/5)*x) = 0
(6/5)*x+12 = 0
6/5*x+12 = 0 // - 12
6/5*x = -12 // : 6/5
x = -12/6/5
x = -10
x = -10
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