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2*(4*x-k) = -2*(1/4)*x // + -2*(1/4)*x
2*(4*x-k)-(-2*(1/4)*x) = 0
2*(4*x-k)+(1/2)*x = 0
2*(4*x-k)+x/2 = 0
(2^2*(4*x-k))/2+x/2 = 0
2^2*(4*x-k)+x = 0
17*x-4*k = 0
(17*x-4*k)/2 = 0
(17*x-4*k)/2 = 0 // * 2
17*x-4*k = 0
17*x-4*k = 0 // + -4*k
17*x = -(-4*k) // : 17
x = (-(-4*k))/17
x = (4*k)/17
x = (4*k)/17
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