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(1/3)*x-(3*x)+1/7 = 395/21 // - 395/21
(1/3)*x-(3*x)+1/7-(395/21) = 0
(1/3)*x-3*x+1/7-395/21 = 0
-8/3*x-56/3 = 0 // + 56/3
-8/3*x = 56/3 // : -8/3
x = 56/3/(-8/3)
x = -7
x = -7
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