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(1/7)*x-2*x-(2/3) = 298/21 // - 298/21
(1/7)*x-2*x-(2/3)-(298/21) = 0
(1/7)*x-2*x-2/3-298/21 = 0
-13/7*x-104/7 = 0 // + 104/7
-13/7*x = 104/7 // : -13/7
x = 104/7/(-13/7)
x = -8
x = -8
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