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8-((6/7)*x) = 9 // - 9
8-((6/7)*x)-9 = 0
(-6/7)*x-9+8 = 0
-6/7*x-1 = 0 // + 1
-6/7*x = 1 // : -6/7
x = 1/(-6/7)
x = -7/6
x = -7/6
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