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(5/7)*x-((1/3)*x)+6 = 386/63 // - 386/63
(5/7)*x-((1/3)*x)-(386/63)+6 = 0
(5/7)*x+(-1/3)*x-386/63+6 = 0
8/21*x-8/63 = 0 // + 8/63
8/21*x = 8/63 // : 8/21
x = 8/63/8/21
x = 1/3
x = 1/3
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