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(-1/3)*x+6 = 7/3 // - 7/3
(-1/3)*x-(7/3)+6 = 0
(-1/3)*x-7/3+6 = 0
11/3-1/3*x = 0 // - 11/3
-1/3*x = -11/3 // : -1/3
x = -11/3/(-1/3)
x = 11
x = 11
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