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9-((6/7)*x) = (1/2)*x-(45/14) // - (1/2)*x-(45/14)
45/14-((6/7)*x)-((1/2)*x)+9 = 0
(-6/7)*x+(-1/2)*x+45/14+9 = 0
171/14-19/14*x = 0 // - 171/14
-19/14*x = -171/14 // : -19/14
x = -171/14/(-19/14)
x = 9
x = 9
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