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(4*x)/7-(2*x)-(3/3) = 19/21 // - 19/21
(4*x)/7-(2*x)-(3/3)-(19/21) = 0
(4*x)/7-2*x-19/21-1 = 0
-10/7*x-40/21 = 0 // + 40/21
-10/7*x = 40/21 // : -10/7
x = 40/21/(-10/7)
x = -4/3
x = -4/3
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