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(2*x)/7-(x/3)+2+3 = 19/21 // - 19/21
(2*x)/7-(x/3)-(19/21)+2+3 = 0
(2*x)/7-(x/3)-19/21+2+3 = 0
86/21-1/21*x = 0 // - 86/21
-1/21*x = -86/21 // : -1/21
x = -86/21/(-1/21)
x = 86
x = 86
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