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x in (-oo:+oo)
x/6 = -15/12 // + -15/12
x/6-(-15/12) = 0
x/6+5/4 = 0
1/6*x+5/4 = 0 // - 5/4
1/6*x = -5/4 // : 1/6
x = -5/4/1/6
x = -15/2
x = -15/2
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