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(4/7)*((21/8)*x+1/2) = 2*(1/7-((5/28)*x)) // - 2*(1/7-((5/28)*x))
(4/7)*((21/8)*x+1/2)-(2*(1/7-((5/28)*x))) = 0
(4/7)*((21/8)*x+1/2)-2*((-5/28)*x+1/7) = 0
4/7*(21/8*x+1/2)-2*(1/7-5/28*x) = 0
4/7*(21/8*x+1/2)-2*(1/7-5/28*x) = 0
13/7*x = 0
(13*x)/7 = 0
(13*x)/7 = 0 // * 7
13*x = 0
13*x = 0 // : 13
x = 0
x = 0
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