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x in (-oo:+oo)
x/9+1/12 = -2/15 // + -2/15
x/9+1/12-(-2/15) = 0
x/9+1/12+2/15 = 0
1/9*x+13/60 = 0 // - 13/60
1/9*x = -13/60 // : 1/9
x = -13/60/1/9
x = -39/20
x = -39/20
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