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3-6*x = -21/11 // + -21/11
3-6*x-(-21/11) = 0
21/11-6*x+3 = 0
54/11-6*x = 0 // - 54/11
-6*x = -54/11 // : -6
x = -54/11/(-6)
x = 9/11
x = 9/11
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