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(2/3)*x-(4*x)+1 = 21/11 // - 21/11
(2/3)*x-(4*x)-(21/11)+1 = 0
(2/3)*x-4*x-21/11+1 = 0
-10/3*x-10/11 = 0 // + 10/11
-10/3*x = 10/11 // : -10/3
x = 10/11/(-10/3)
x = -3/11
x = -3/11
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