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9-x = (-1/6)*x+2 // - (-1/6)*x+2
9-x-((-1/6)*x)-2 = 0
(1/6)*x-x-2+9 = 0
7-5/6*x = 0 // - 7
-5/6*x = -7 // : -5/6
x = -7/(-5/6)
x = 42/5
x = 42/5
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