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