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(1/7)*x-6 = (5/6)*x-(271/21) // - (5/6)*x-(271/21)
(1/7)*x-((5/6)*x)+271/21-6 = 0
(1/7)*x+(-5/6)*x+271/21-6 = 0
145/21-29/42*x = 0 // - 145/21
-29/42*x = -145/21 // : -29/42
x = -145/21/(-29/42)
x = 10
x = 10
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