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(6-9)*((6*x)/7) = -8 // + 8
(6-9)*((6*x)/7)+8 = 0
8-18/7*x = 0 // - 8
-18/7*x = -8 // : -18/7
x = -8/(-18/7)
x = 28/9
x = 28/9
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