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(10/7)*(21*x-7) = 4*((1/8)*x+0) // - 4*((1/8)*x+0)
(10/7)*(21*x-7)-(4*((1/8)*x+0)) = 0
(10/7)*(21*x-7)+(-1/2)*x = 0
10/7*(21*x-7)-x/2 = 0
(10/7*2*(21*x-7))/2-x/2 = 0
10/7*2*(21*x-7)-x = 0
59*x-20 = 0
(59*x-20)/2 = 0
(59*x-20)/2 = 0 // * 2
59*x-20 = 0
59*x-20 = 0 // + 20
59*x = 20 // : 59
x = 20/59
x = 20/59
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