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(-1/2)*x+8/9 = 17/36 // - 17/36
(-1/2)*x+8/9-(17/36) = 0
(-1/2)*x+8/9-17/36 = 0
5/12-1/2*x = 0 // - 5/12
-1/2*x = -5/12 // : -1/2
x = -5/12/(-1/2)
x = 5/6
x = 5/6
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