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x in (-oo:+oo)
x/(-3) = 7/18 // - 7/18
x/(-3)-(7/18) = 0
x/(-3)-7/18 = 0
-1/3*x-7/18 = 0 // + 7/18
-1/3*x = 7/18 // : -1/3
x = 7/18/(-1/3)
x = -7/6
x = -7/6
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