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9-x-((3/7)*x) = 163/7 // - 163/7
9-x-((3/7)*x)-(163/7) = 0
(-3/7)*x-x-163/7+9 = 0
-10/7*x-100/7 = 0 // + 100/7
-10/7*x = 100/7 // : -10/7
x = 100/7/(-10/7)
x = -10
x = -10
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