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4/3-((6/7)*x) = 9/21 // - 9/21
4/3-((6/7)*x)-(9/21) = 0
(-6/7)*x+4/3-3/7 = 0
19/21-6/7*x = 0 // - 19/21
-6/7*x = -19/21 // : -6/7
x = -19/21/(-6/7)
x = 19/18
x = 19/18
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