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(4/7)*x-(2*x)-1/3 = -67/21 // + -67/21
(4/7)*x-(2*x)-1/3-(-67/21) = 0
(4/7)*x-2*x-1/3+67/21 = 0
20/7-10/7*x = 0 // - 20/7
-10/7*x = -20/7 // : -10/7
x = -20/7/(-10/7)
x = 2
x = 2
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