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x in (-oo:+oo)
4*x-(2*x)-(1/4) = 9*x+1/2+2/6 // - 9*x+1/2+2/6
4*x-(2*x)-(9*x)-(1/4)-(1/2)-(2/6) = 0
4*x-2*x-9*x-1/4-1/2-1/3 = 0
-7*x-13/12 = 0 // + 13/12
-7*x = 13/12 // : -7
x = 13/12/(-7)
x = -13/84
x = -13/84
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