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(6/7)*x+2/3 = (1/3)*x-(8/7) // - (1/3)*x-(8/7)
(6/7)*x-((1/3)*x)+2/3+8/7 = 0
(6/7)*x+(-1/3)*x+2/3+8/7 = 0
11/21*x+38/21 = 0 // - 38/21
11/21*x = -38/21 // : 11/21
x = -38/21/11/21
x = -38/11
x = -38/11
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