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(4/7)*x+9 = (-2/3)*x+293/21 // - (-2/3)*x+293/21
(4/7)*x-((-2/3)*x)-(293/21)+9 = 0
(4/7)*x+(2/3)*x-293/21+9 = 0
26/21*x-104/21 = 0 // + 104/21
26/21*x = 104/21 // : 26/21
x = 104/21/26/21
x = 4
x = 4
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