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x in (-oo:+oo)
(0/12)*(x+1) = 0
0 = 0
0/12 = 0
0 = 0
0/12 = 0 // * 12
0 = 0
x+1 = 0
x+1 = 0 // - 1
x = -1
(0/12)*(x+1) = 0 <=> 0/12 = 0 or (0/12)*(x+1) = 0 <=> x+1 = 0
x in (-oo:+oo)
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