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7/9 = -6*x // + -6*x
7/9-(-6*x) = 0
6*x+7/9 = 0
6*x+7/9 = 0 // - 7/9
6*x = -7/9 // : 6
x = -7/9/6
x = -7/54
x = -7/54
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