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x in (-oo:+oo)
x/12 = -13/2 // + -13/2
x/12-(-13/2) = 0
x/12+13/2 = 0
1/12*x+13/2 = 0 // - 13/2
1/12*x = -13/2 // : 1/12
x = -13/2/1/12
x = -78
x = -78
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