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x in (-oo:+oo)
x/2+4/4 = 9/12 // - 9/12
x/2+4/4-(9/12) = 0
x/2+4/4-3/4 = 0
1/2*x+1/4 = 0 // - 1/4
1/2*x = -1/4 // : 1/2
x = -1/4/1/2
x = -1/2
x = -1/2
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