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x in (-oo:+oo)
x/2 = 4/5+9/12 // - 4/5+9/12
x/2-(4/5)-(9/12) = 0
x/2-4/5-3/4 = 0
1/2*x-31/20 = 0 // + 31/20
1/2*x = 31/20 // : 1/2
x = 31/20/1/2
x = 31/10
x = 31/10
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