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(2/3)*x+4/7 = 4*x+106/63 // - 4*x+106/63
(2/3)*x-(4*x)+4/7-(106/63) = 0
(2/3)*x-4*x+4/7-106/63 = 0
-10/3*x-10/9 = 0 // + 10/9
-10/3*x = 10/9 // : -10/3
x = 10/9/(-10/3)
x = -1/3
x = -1/3
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