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x in (-oo:+oo)
18*x-(25*x) = 1/3 // - 1/3
18*x-(25*x)-(1/3) = 0
18*x-25*x-1/3 = 0
-7*x-1/3 = 0 // + 1/3
-7*x = 1/3 // : -7
x = 1/3/(-7)
x = -1/21
x = -1/21
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