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(1/7)*(3*x-1)+(1/3)*(5*x+8) = 39-(5*x) // - 39-(5*x)
(1/7)*(3*x-1)+(1/3)*(5*x+8)+5*x-39 = 0
1/7*(3*x-1)+1/3*(5*x+8)+5*x-39 = 0
1/7*(3*x-1)+1/3*(5*x+8)+5*x-39 = 0
44/21*x+5*x-39+53/21 = 0
149/21*x-39+53/21 = 0
149/21*x-766/21 = 0
149/21*x-766/21 = 0
149/21*x-766/21 = 0 // + 766/21
149/21*x = 766/21 // : 149/21
x = 766/21/149/21
x = 766/149
x = 766/149
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