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(-1/2)*x-(2/9) = -7/18-(2/3) // + -7/18-(2/3)
(-1/2)*x-(2/9)-(-7/18)+2/3 = 0
(-1/2)*x-2/9+7/18+2/3 = 0
5/6-1/2*x = 0 // - 5/6
-1/2*x = -5/6 // : -1/2
x = -5/6/(-1/2)
x = 5/3
x = 5/3
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